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Choose the correct answer
1,A stop B stopped 5,A will B would
2,A give B gave 6,A live B will live
3,A will eat B ate 7,A will B would
4, A will get B would get 8,A will B would
Dear Marsha
I'm not sure what to do I'm thinking of becoming a vegetable, but some of my friends say it's a bad idea. They say that if I (1)_stop_ eating meat, my body won't get all the things it needs to say healthy. Are my friends right?
Thanks,
Yuri, age 14
Dear Yuri
Millions of people vegetable and they're perfectly healthy. You have to be careful, though if you (2)_gave _ up eating meat completely, and only (3)_ate__ chocolate and crips, that would obiviously be very baf for you ! If people don't eat properly, they (4)_will get__ ill.It's that simple.If you eat lots of fruit ad salad and beans, you (5)_will__ get all the things you need to say healthy.But you're only 14years old. If you (6)__live_ at home with your parents and you probably do -you'll have to ask them what they think too. If your mum cooks for you , (7) it _will_ be difficult for her to make you special meals. If I were you, I (8)_would__ think about this carefully and maybe wait until you're a bit older before making such a big decision.
Marsha
Complete using the correct form of the words in brackets
1, If you _had told__(tell) me you were going to the beach, I'd have come with you
2, If Dan had missed the plane, he _would have been_(be) very annoyed3, I'd have got you a present if I __had known_(know) it was your birthday
4,We _wouldn't have got__(not/get) lost if we'd taken a map with us
5, If the car _hadn't break down__(not/break down), I wouldn't have been late
6, If you _hadn't helped__(not /hep) me , I wouldn't have finished in time
7, If Baz_don't show__(not/show) you what to do, what _will you do__(you/do)?
Complete using the correct form of the words in brackets
1, If you _had told__ (tell) me you were going to the beach ,I'd have come with you
2,If Dan had missed the plane, he _would have been__(be) very annoyed
3,I'd have got you a present if I __had known_ (know) it was your birthday4, We_wouldn't have got__ (not/get) lost if we'd taken a map with us
5,If the car _hadn't break down___(not/break down), I wouldn't have been late
6, If you __hadn't helped__(not/help) me, I wouln't have finished in time
7, If Baz __don't show__(not/ show) you what to do, what_will you do_(you/do)?
Complete each second so that it has a similar meaning to the first sentences. Write between two and five words
1, It wasn't cold, so we didn't light a fire
If it __had been_ cold , we'd have lit a fire
2, John didn't come, so we didn't do any thing
If John __had come_,we'd have done some painting
3, Claire didn't buy any clothes because she didn't see anything she liked
Claire __would have bought__some clothes if she'd seen something she liked
4,The audience laughted because the joke was very funny
If the joke __hadn't been__very funny, the audience wouldn't have laughed5, We decided to leave because it was really noisy
We _wouldn't have decided_ to leave if it hadn't been really noisy
6, Sylvia doesn't have enough money, so she can't buy a new computer
If Sylvia____had___ enough money, she'd buy a new computer
7, The twins don't see their friends often because they're very busy
If the twins weren't so busy, they__would see__ their friends more often
8, Grandma won't get a dog because she lives in a small flat
If Grandma_didn't live___in a small flat, she'd get a dog
9, I think you should tell your parents the truth
If I _were__ you, I'd tell your parents the truth
WRITE A SENTENCE WITH IF FOR EACH SITUATION
1. he is poor, so he can't make an abroad tour
-> were he not poor, he could make an abroad tour
2. we came home from ourr holiday early because we ran out of money
-> had we not run out of money,we wouldn't have come home from ourr holiday early
3. i can't enter the room now because i left the key at home
-> if I hadn't left the key at home,I would have entered the room now
4/ the men is wearing protective clothing, so they are safe
-> the men wouldn't be safe if they weren't wearing protective clothing
5. be patient or you will destroy everything
-> if you aren't patient, you will destroy everything
6. they used to drink beer for breakfast in england years ago
-> beer used to be drunk for breakfast in england years ago
#cont
REWRITE THE FOLLOWING SENTENCES
1. i think you shouldn't take part in this dancing club
-> if i were you,I wouldn't take part in this dancing club
2. i advise you to listen to the teacher during the lesson
-> if i were you,I would listen to the teacher during the lesson
3. leave me alone or i will call the police
-> if you leave me alone , i will call the police
4. finish your paper or you can't go home
-> if you don't finish your paper , you can't go home
5. they made the little boy climb the chimneys to clean them
-> the little boy was made to climb the chimneys to clean them
6. they say exercise is good for health
-> exercise is said to be good for health
7. you need to have your hair cut
-> your hair needs cutting
8. andrew wanted to ask Frank Sinatra for his autograph, but he wasn't brave enough
-> had andrew been brave enough,he would have asked Frank Sinatra for his autograph.
9. i don't know anything about plumbing so i can't fix the leak in the sink myself
-> were I to know anything about plumbing ,I could fix the leak in the sink myself
10. you need to have your housse rebuilt
-> your house needs rebuilting
11. my parents have just given one of my most favorite toy to me
-> one of my most favorite toys has just been given to me by parents
12. it is said that on of the workers quits the job
-> one of the workers is said to quit the job
13. the students need to do homework every day
-> the homework needs doing be the students everyday
14. my father made me get to school by bike
-> i was made to get to school by bike
15. the kind boss has allowed the unemployed to work in his company
-> the unemployed have been allowed to work in the kind boss's company
16. he doesn't like people laughing at him
-> he doesn't like being laughed at
17. mrs. lan has taken care of the old in my neighborhood recently
-> the old in my neighborhood has been taken care by mrs lan recently
18. no one in my family has eaten a snail before
-> a snail has never been eaten before in my family
19. nobody in the party has tasted my dishes
-> my dishes has never been tasted in the party
20. bring the raincoat with you or you will get wet on the way back
-> should you bring the raincoat with you or you will get wet on the way back
21. there is a grammar error in this English essay, that's why it can't get a full mark
-> if there weren't a grammar error in this English essay, it could get a full mark
22. because i don't have a typewriter, i can't type it myself
-> i could type it if I had a typewriter
23. he was tired so he made a mistake
-> if he weren't tired ,he wouldn't have made a mistake
24. he has just brought some cups of tea to the visitors in the next room
-> some cups of tea have just been bought for the visitors in the next room
25. she can't be employed because she doesn't have college degree
-> if she had college degree,she could be employed
26. there are industrial factories inside the city, that's why pollution can't be reduced
-> pollution could be reduced if there weren't industrial factories inside the city
27. it rained heavily so they didn't go camping last sunday
-> had it not rained heavily ,they would have gone camping last sunday
28. although the weather was bad, i still got to schoold
-> in spite of the bad weather,i still got to schoold
29. he still went to work although he felt too tired
-> despite being tired,he still went to work
30. because it rained , we decided to stay home and watch tv
-> because of raining, we decided to stay home and watch tv
WRITE A SENTENCE WITH IF FOR EACH SITUATION
1. he is poor, so he can't make an abroad tour
-> were he to be rich, he could make an abroad tour
2. we came home from ourr holiday early because we ran out of money
-> had we not run out of money, we would not have come home from our holiday early
3. i can't enter the room now because i left the key at home
-> if I hadn't left the key at home, I could enter the room now
4/ the men is wearing protective clothing, so they are safe
-> the men would be safe with protective clothing
5. be patient or you will destroy everything
-> if you aren't patient, you will destroy everything
6. they used to drink beer for breakfast in england years ago
-> beer used to be drunk for breakfast in england years ago
REWRITE THE FOLLOWING SENTENCES
1. i think you shouldn't take part in this dancing club
-> if i were you, i wouldn't take part in this dancing club
2. i advise you to listen to the teacher during the lesson
-> if i were you, i would listen to the teacher during the lesson
3. leave me alone or i will call the police
-> if you don't leave me alone, i will call the police
4. finish your paper or you can't go home
-> if you don't finish your paper, you can't go home
5. they made the little boy climb the chimneys to clean them
-> the little boy was made to climb the chimneys to clean them
6. they say exercise is good for health
-> exercise is said to be good for health
7. you need to have your hair cut
-> your hair needs cutting
8. andrew wanted to ask Frank Sinatra for his autograph, but he wasn't brave enough
-> had Andrew been brave enough, he would have asked Frank Sinatra for his autograph
9. i don't know anything about plumbing so i can't fix the leak in the sink myself
-> were i to know something about plumbing, i could fix the leak in the sink myself
10. you need to have your housse rebuilt
-> your house needs to be rebuilt
11. my parents have just given one of my most favorite toy to me
-> one of my most favorite toys has just been given to me by my parents
12. it is said that on of the workers quits the job
-> one of the workers is said to quit the job
13. the students need to do homework every day
-> the homework needs to be done by the students every day
14. my father made me get to school by bike
-> i was made to get to school by bike by my father
15. the kind boss has allowed the unemployed to work in his company
-> the unemployed have been allowed to work in his company by the kind boss
16. he doesn't like people laughing at him
-> he doesn't like being laughed at
17. mrs. lan has taken care of the old in my neighborhood recently
-> the old in my neighborhood has been taken care of by mrs lan recently
18. no one in my family has eaten a snail before
-> a snail has never been eaten by a member in my family before
19. nobody in the party has tasted my dishes
-> my dishes have never tasted in the party
20. bring the raincoat with you or you will get wet on the way back
-> should you to bring the raincoat with you, you won't get wet on the way back
21. there is a grammar error in this English essay, that's why it can't get a full mark
-> if there weren't a grammar error in this english essay, it could get a full mark
22. because i don't have a typewriter, i can't type it myself
-> i could type myself if i had a typewriter
23. he was tired so he made a mistake
-> if he hadn't been tired, he wouldn't have made a mistake
24. he has just brought some cups of tea to the visitors in the next room
-> some cups of tea has just been bought to the visitors in the next room
25. she can't be employed because she doesn't have college degree
-> if she had a college degree, she could be employed
26. there are industrial factories inside the city, that's why pollution can't be reduced
-> pollution could be reduced if there weren't industrial factories inside the city
27. it rained heavily so they didn't go camping last sunday
-> had it not rained heavily, they could have gone camping last sunday
28. although the weather was bad, i still got to schoold
-> in spite of the bad weather, i still got to school
29. he still went to work although he felt too tired
-> despite feeling too tired, he still went to work
30. because it rained , we decided to stay home and watch tv
-> because of raining weather, we decided to stay home and watch tv
II. Fill in the blank with a suitable preposition.
1. The Christmas tree is........in front of..........the window.
2. The dart is flying.......to..........the target.
3. The satellites are orbiting.......around.........the planet.
4. The little girl is shelteriing.....below..........the rain.
5. The horse is jumping.......over.......the fences.
6. The bird is swinging.....on........its cage.
7. The ball is going.......up.........the basket.
8. The foal is standing......beside........its mother.
9. The Dalmatian is running........after..........the black cat.
10. The number 5 is.......between.........4 and 6.
I.
1. I didn't like the food. I found it most unpleasant PLEASURE
III. Complete these sentences using CHANCE OF-ING or CHANCE TO. Each time use the verb in brackets.
1. I'd like to go to the concert but I've got no chance of getting tickets now. They'll have sold out. GET
2. He was badly injured in the crash but the doctors at the hospital say that he has a very good chance of recovering completely. RECOVER
3. "Have you written that letter to Jack?" - " No, I didn't have a chance to do it today. There was so much else to do." DO
4. There isn't much a cheap apartment in the city centre. FIND
-> I don't stand a chance of finding a cheap apartment in the city centre
5. We're always very busy at work. We don't get much chance to talk to each other. TALK
6. A lot of people have applied for this job. If I apply, I don't think I stand a very good chance of getting it. GET
7. I'm afraid I didn't have the chance to visit you while I was in London. I was only there for three days and there wasn't enough time. VISIT
8. If you work hard at your job, you have a good chance of being promoted. BE
9. I don't think there is much chance of the rain stopping. The sky is very grey. STOP
10. These days I don't get much chance to watch television. WATCH
I/ Give the correct tense of the verbs in brackets :
1. Mother (cook) is cooking some food in the kitchen at present. She always (cook) cooks in the moning
2. We (live) have lived in this city for 20 years. We love this city very much
3. Thomas (finish) finished his home work. He's going to school
4. I (already /see) have already seen that film. I don't want to see it again
5. I (read) have read "Gone with the Wind" twice. I still want to read it again
6. I (not be) haven't been to Da Lat. I have heard that it is a beautiful city
7. She (just/leave) had just left the party when you arrived
8. Up to the now, George (write) has written five children books
9 Have You (do) done anything interesting lately ?
10. What have they (learn) learnt so far?
11. We (wait) have been waiting / have waited for the bus for an hour
12. Have You (do) done your homework yet?
13. They had sold all the books when we (get) got there
14. She (play) was playing the piano when our guests (arrive) arrived
15. Listen! I think someone (knock) is knocking at the door.
16. She made me (feel) feel uncomfortable when I got home.
17. He suggests (see) seeing the director immediately.
18. Do you wish (be) to be offered a present?
19. I don't enjoy (watch) watching television all the time.
20. She is looking forward to (see) seeing the manager again.
21. I promise (meet) to meet you here.
22. They avoid (hold) holding the party because she was out.
23. Last night before he (watch) watched TV, he (do) had done the exercise.
24.I don't mind (work) working late, if it will help at all.
25. We managed (climb) to climb over the wall without (see) seeing
26. Tim (not/ take) hasn't taken many photos yet.
27. She (study) is studying English at the moment
I. Error identification & correct (xác định và sửa lỗi sai)
Example: It’s difficult getting there on time in rush hour.
getting → to get
1. He does his homework at the moment. -> is doing
2. He is learning cooking at the moment. -> to cook
3. What do you usually do at your free time? -> in
4. You should practise speak English before you go to England. -> speaking
5. She is very good of writing essays. -> at
6. I am really not interested of going to high school. -> in
7. He thanks her about inviting him to the party. -> for
8. They don’t go to the swimming pool because the rain. -> because of
9. They don’t go to the swimming pool because the rain. -> because of
10. Would you like going to a pop concert this weekend. -> to go
II. Complete the sentences with although/ in spite of/ because/ because of.
1. because the meeting's at 2.00, I won't be able to see you.
2. although I told the absolute truth, no one would believe me.
3. The goods were never delivered in spite of the promise we had received.
4. My mother is always complaining because of the untidiness of my room.
5. I didn't get the job although I had all the necessary qualifications.
6. It's unsafe to travel in that country because of the ongoing civil war.
7. The villagers refused to leave in spite of the drought.
8. because everything looked different, I had no idea where to go.
9. because of his age, John was not hired although he had the necessary
qualifications.
10. You can't enter this secure area because you don't have an official permit.
Combine these sentences using : That , which , who , whom or whose
1. A woman answered the phone . She told me you was busy .
=> A woman who told me you was busy answered the phone.
2. The bus is always crowded . I take it to school every morning .
=> The bus which I take to school every morning is always crowded.
3. They are singing a song. I don’t know the song .
=> They are singing a song which I don't know.
4. A man spoke to me . He was very helpful .
=> A man who was very helpful spoke to me.
5. A midwife is a woman. She assists other women in childbirth .
=> A midwife is a woman who assists other women in childbirth.
6. They are the children . Their team won the match .
=> They are the children whose team won the match.
7. The house is for sale . It has the green shutters .
=> The house which has the green shutters is for sale.
8. My farther bought a motorbike . The motorbike costs 2 thousand dollars.
=> My father bought a motorbike which costs 2 thousand dollars
9. They are the postcards . I sent them from Australia.
=> They are the postcards which I sent from Astralia.
10. The house has been built in the forest . It doesn’t have electricity
=> The house which doesn't have electricity has been built in the forest.
11. The girl chatted with him yesterday . She arrived here at 6 : 30.
=> The girl who arrived here at 6:30 chatted with him yesterday.
12. I’m reading the book . I bought it in London in 1996 .
=> I'm reading the book which I bought in London in 1996.
13. Trang couldn’t come to the party . This was perfectly true.
=>Trang couldn't come to the party which was perfectly true.
14. Do you know the girl ? Tom is talking to the girl.
=> Do you know the girl whom Tom is talking to?
15. Tuan speaks English very well . He comes from Vietnam.
=>Tuan, who comes from Vietnam, speaks English very well.
16. The man invited me to his party . He was really polite .
=> The man who was really polite invited me to his party.
17. A lion is an animal . This animal lives in Africa .
=> A lion is an animal that lives in Africa.
18. I have a class . It begins at 8 a.m .
=> I have a class which begins at 8 a.m.
19. A globe is a ball . This ball has a map of the world on it .
=> A globe is a ball which has a map of the world on it.
20. The soup was too salty . I had it for lunch .
=> The soup which I had for lunch was too salty.
21.We are visiting Ha Long . Ha Long is in the north of Vietnam.
=> We are visiting Ha Long, which is in the north of Vietnam.
22. My father is a doctor . He has gone to abroad .
=> My father, who has gone to abroad, is a doctor.
23. Ms Kim Anh will be our History teacher next semester . You talked with her yesterday .
=> Ms Kim Anh, whom you talked with yesterday, will be our History teacher next semester.
24. The watch belongs to Lam . It is in the bathroom .
=> The watch which is in the bathroom belongs to Lam.
25. Do you know the new student ? I can’t remember his name .
=> Do you know the new student whose name I can't remember?
26. Mary is a bit deaf . She didn’t hear the phone.
=> Mary, who didn't hear the phone, is a bit deaf.
27. We’ll meet Peter tomorrow . He has 2 brothers and one sister .
=> Tomorrow we'll meet Peter, who has 2 brothers and one sister.
28. We are talking to Viet Nam . Viet Nam has a population of 87 million people.
=> We are talking to Vietnam, which has a population of 87 million people.
29. We are talking to Viet Nam . Its population is 87 million people .
=> We are talking to Vietnam, the population of which is 87 million people.
30. I should phone the man . I borrowed his car yesterday .
=> I should phone the man whose car I borrowed yesterday.
31. She can’t speak English . It is a disadvantage .
=> She can't speak English, which is a disadvantage.
32. I’m staying with Henry . His father works in a bank
=> I'm staying with Henry, whose father works in a bank.
33. Do you remember Mrs Lan ? She taught us History.
=> Do you remember Mrs Lan who taught us History?
34. The museum was built in 1805 . Our class visited it last weekend.
=> The museum which our class visited last weekend was built in 1805.
35. The man works in the hospital . I told you about him .
=> The man whom I told you about works in the hospital.
36. Do you like the person ? The person sits next to you .
=> Do you like the person who sits next to you?
37. The house costs a lot of money . My father bought it last year .
=> The house which my father bought last year costs a lot of money.
38. We are visiting the children . Their parents died in the storm .
=> We are visiting the children whose parents died in the storm.
39. My sister is rather childish . She was trained to be a sewer .
=> My sister, who was trained to be a sewer, is rather childish.
40. Colin told me about his new job . He enjoys it very much .
=> Colin told me about his new job, which he enjoys very much.
41 . We know a lot of people . They live in London .
=> We know a lot of people who live in London.
42. We know her grandparents . They live in London.
=> We know her grandparents who live in London.
43. We met some people . Their car had broken down .
=> We met some people whose car had broken down.
44. We stayed at the Cau Vong hotel . Nam recommended it to us .
=> we stayed at the Cau Vong hotel, which Nam recommended to us.
45. Jane works for a company . It makes shoes .
=> Jane works for a company which makes shoes.
46. She told me her address . I wrote down it on a piece of paper .
=> She told me her address which I wrote down on a piece of paper.
47. There are some words . They are very difficult to translate.
=> There are some words which are very difficult to translate.
48. John is one of my closest friends . I have known him for a very long time .
=> John, whom I have known for a very long time, is one of my friends.
49. A pacifist is a person . He believes that all wars are wrong .
=> A pacifist is a person who believes that all wars are wrong.
50. What is the name of the man ? You borrowed his car .
=> What is the name of the man whose car you borrowed?
51. This watch costs a lot of money . I have lost the watch .
=> This watch, which I have lost, costs a lot of money.
52. We were given a lot of information . Most of the information was useless .
=> We were given a lot of information, most of which was useless.
,Put the verbs in brackets in their correct form
1, If we (not) don't on electricity, there will be power cuts
2, I hope he (finish) will finish his homework before we (get) get back
3, If we sit too far away from the screen I (not be) won't be able to see the film
4, Listen to those people! What langauge are they (speak) speaking?
5,It is an awful fim. It (be) is the worst film that I ever (see) have seen
6,Khanh usually (play) plays football with his friends after school, but yesterday he (not play ) didn't play as he was tired
7,After three days of rain, I'm glad the sun (shine) shines again today
8, ___ I know from my experience that (gain)___ a good knowledge of a foreign language, one must work hard at it every day.
9, I (repaint) repainted the walls. They lock great! The room (be) is much lighter now.
10, Someone (steal) will steal your car if you leave it unlicked
11, If he (wash) washes my car , I'll give him $10
12, They'll be very angry if she (make) makes any more mistakes
13, If you are late, they (not let) won't let you in.
14, If lend you $10, when will you (repay) repay me?
15, If I find your passport, I (telephone) will telephone you at once
16,He will ruin his eyes if he (read) reads in bad light
17, If I tell you a secrect, will you (promise) promise not to tell it to anyone else?
18, If I see him, I (give) will get him a lift
19, If he (be) is late, we'll go without him
2,Give the correct form of the words in brackets to finish the letter
Dear Kay,
Isabella and I are having the (good) best holiday of our life! We are in Vinabliss Resort, one of the (lovely) most lovely islands in the Eastern Sea. Although it is much (small) smaller than Vinaland, there seems to be (much) more to do than in Vinaland. Moreover, the people here seem to be (friendly) more friendly than those on other islands. We are staying in the (moden) more modern hotel I have ever seen. It is far(comfortable) more comfortable than any other and it is even (big) bigger than the world-famous Calton hotel .The (near) nearest beach is (little) less than a hundred metres away, so we can swimin a lot. It's really good and I want you to be here with us.
Love,
Maltida
3,Choose a suitable word from the box put in each blank to finish the passage
| from | means | in | waste | possible |
| wind | should | green | However | who |
Much of our waste, especially waste (1) from factories, electric-poweres stations, the chemica indusrty and heavy industry, is very dangerous. Fish die (2) in the lakes, rivers and seas; forest trees die, too. Much of this dangerous (3) waste goes into the air and is carried by the (4) wind for great distances.
The Earth is our home. We (5) should take care of it, for ourselves, and for our children and grandchidren. This (6) means we have to keep our enviroment (7) green and clean. The importance of this task is pointed out by ecologists-the scientists (8) who study the relations between living things and the enviroment . (9) However , each of us must do everything (10) possible to keep the land, air and water clean
| trees | metal | protect | damage | recycle | enviroment |
| danger | rubbish | save | animals |
11, Some factories recycle empty bottles and cans
12,We shouldn't damage forests.
13, It's important to save our skin from harmful effects from the sun
14, Metal, paper and glass can recycle
15, We should plant more trees in our city
16, We have to do everything to protect the environment
17, Some animals in the world are in danger now
18, Don't throw rubbish in the streets
19, People are doing a lot of things to damage the environment
20, We are destroying wild animals and plants
4, Join the pairs of sentences, using the suggestions given in brackets
1, I must ring john. i won't forget, I hope.(I hope I....)
=> I hope I won't forget to ring John
2, His uncle helped him. He was able to finish his course.(Because....)
=> Because his uuncle helped him, he was able to finish his course
3,I think we should go ahead. No one disapproves of the plan.(As..)
=> As no one disapproves of the plan , we should go ahead
4, It was raining heavily. They continued to play tennis. (Although ...)
=> Although it was raining heavily , they continued to play tennis
5, "Ambulance" is written backwawrds. You can read it in the mirror (....so....)
=> "Ambulance" is written backwawrds so you can read it in the mirror
. Put a tag question at the end of the sentences
1. In big cities, life can become very difficult and unpleasant, can't it?
2. The world will soon become overpopulated, won't it?
3. You haven’t gone to Rio de Janeiro, do you?
4. They didn’t like the film, did they?
5. Jeju Island looks very peaceful, doesn't it?
6. We don’t have to go yet, do we ?
7. You don’t like pollution, _____do you_______?
8. I think a megacity is a very large city with big population, _____don't I_______?
9. You won’t tell anyone, ____will you________?
10. The number of English speakers is increasing very quickly, ______isn't it______?
11. You need an English – Vietnamese dictionary, _____don't you_______?
12. You have never watched any films made in Bollywood, ______haven't you______?
13. You’re waiting for your letter, ___aren't you_________?
14. We had a good time, _____didn't we_______?
15. Some people commit crime when they have no money and no food, ______don't they______?
16. You enjoy living in a peaceful neighbourhood, _____don't you_______?
17. It’s hot today, ______isn't it______?
18. The factory will bring more jobs to local people, ______won't it______?
19. You forgot to bring your textbooks this morning, ______didn't you______?
20. The idea can change the solution, ____can't it________?