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21 tháng 9 2019

THÌ QUÁ KHỨ ĐƠN

THÌ QUÁ KHỨ TIẾP DIỄN

Tobe

S + was/were + Ved/V2

Ví dụ:

She was an attractive girl. (Cô ấy đã từng là một cô gái cuốn hút.)

Verbs

S + Ved/V2

Ví dụ: I started loving him when I was the first year student.(Tôi đã bắt đầu yêu anh ấy khi còn là sinh viên năm thứ nhất.)

Công thức chung

S + was/were + V – ing

Ví dụ: She was playing piano lonely at night when a thief broke the window to get in. (Khi cô ấy đang chơi piano một mình giữa đêm thì một tên trộm đập vỡ cửa kính để đột nhập vào.)

Học Tốt!!!

trả lời

THÌ QUÁ KHỨ ĐƠNTHÌ QUÁ KHỨ TIẾP DIỄN
TobeS + was/were + adj/NounVí dụ:She was an attractive girl. (Cô ấy đã từng là một cô gái cuốn hút.)VerbsS + V – edVí dụ: I started loving him when I was the first year student. (Tôi đã bắt đầu yêu anh ấy khi còn là sinh viên năm thứ nhất.)Công thức chungS + was/were + V – ingVí dụ: She was playing piano lonely at night when a thief broke the window to get in. (Khi cô ấy đang chơi piano một mình giữa đêm thì một tên trộm đập vỡ cửa kính để đột nhập vào.)   
 hc tốt 

Phân biệt cách sử dụng Used to,Get used to và Be used to

1/ Used to + Verb: Đã từng, từng
Chỉ một thói quen, một hành động thường xuyên xảy ra trong quá khứ và bây giờ không còn nữa.
- When David was young, he used to swim once a day
- I used to smoke a lot.
VD: 
- I used to smoke a packet a day but I stopped two years ago. ( trước đây tôi hút 1 gói thuốc 1 ngày nhưng từ 2 năm trở lại đây tôi không hút thuốc nữa)
- Ben used to travel a lot in his job but now, since his promotion, he doesn't. ( Ben thường đi du lịch rất nhiều khi làm công việc trước đây, nhưng từ khi anh ấy luân chuyển công việc thì không còn nữa)
- I used to drive to work but now I take the bus. ( Trước đây tôi thường lái xe đi làm nhưng hiện nay tôi đi làm bằng xe buýt)
 
 
2/ To be + V-ing/ Noun: Trở nên quen với
He is used to swimming every day : Anh ấy đã quen với việc đi bơi mỗi ngày.
VD:
 - I'm used to living on my own. I've done it for quite a long time. ( Tôi thường ở 1 mình, và tôi đã ở một mình được một khoảng thời gian khá lâu)
- Hans has lived in England for over a year so he is used to driving on the left now. ( Hans đã sống ở Anh hơn 1 năm rồi nên giờ anh ấy quen lái xe bên tay trái)
- They've always lived in hot countries so they aren't used to the cold weather here.( Họ luôn sống ở các vùng nhiệt đới nên họ không quen với khí hậu lạnh ở đây)
 
3/ to get used to + V-ing/ noun
He got used to American food : I got used to getting up early in the morning. Tôi đã dần dần quen với việc thức dậy sớm vào buổi sáng
VD: 
- I didn't understand the accent when I first moved here but I quickly got used to it. ( Lần đầu tiên chuyển đến đây, tôi đã không hiểu được giọng nói ở vùng này nhưng giờ tôi đã nhanh chóng quen dần với nó)
- She has started working nights and is still getting used to sleeping during the day. ( Cô ấy bắt đầu làm việc vào ban đêm và dần quen với việc ngủ suốt ngày)
- I have always lived in the country but now I'm beginning to get used to living in the city. ( Tôi luôn sống ở miền quê nhưng giờ đây tôi bắt đầu dần quen với việc sống ở thành phố)

trên mạng đầy lắm bn ạ 

Hoặc vào 360 động từ bất quy tắc cũng đc

mà nếu ngại kham khảo bài bn ☂❄ღωɦσ мαɗε мε α ρɾĭη¢εʂʂღ❄☂

hc tốt 

Exercise : Chia dạng đúng của động từ trong ngoặc ở thì quá khứ đơn và quá khứ tiếp diễn.1.  WhenI (arrive)            at this house, he still(sleep)        2.  Thelight (go)...........out whilewe(have)...............dinner.3.  Bill(have)...........breakfast whenI (stop)...........at this house thismorning.4.  WhenI (come)..............to his house, he (work)       5.  Aswe(cross)............the street,we(see)..............an accident.6.  Tom (see)................a...
Đọc tiếp

Exercise : Chia dạng đúng của động từ trong ngoặc ở thì quá khứ đơn và quá khứ tiếp diễn.

1.  WhenI (arrive)            at this house, he still(sleep)        

2.  Thelight (go)...........out whilewe(have)...............dinner.

3.  Bill(have)...........breakfast whenI (stop)...........at this house thismorning.

4.  WhenI (come)..............to his house, he (work)       

5.  Aswe(cross)............the street,we(see)..............an accident.

6.  Tom (see)................a serious accident whilehe(stand)..................at the busstop.

7.  Thechildren (play).................football when theirmother (come)................backhome.

8.  Thebell (ring)............whileTom(take)..................a bath.

9.  He(sit)..................in a car whenI(see).................him.

10.  We(clean)...............the house whenshe(come)..............yesterday.

 

2
26 tháng 8 2021

1. arrived / was still sleeping

2. went / were having

3. was having / stopped

4. came / was working

5. were crossing / saw

6. saw / was standing

7. were playing / came

8. rang / was taking

9. was sitting / saw

10. were cleaning / came

26 tháng 8 2021

Tham khảo 

1. When I (arrive) ..arrived ..at this house, he was still sleeping(sleep) .

2. The light (go) ..went ...out while we (have) were having dinner.

3. Bill (have) ..was having..breakfast when I (stop) ..stopped ..at this house this morning.

4. She (wash) was washing....up when Vinh (arrive) ..arrived..at this house.

5. As we (cross) .were crossing...the Street, we (see) ...saw ..an accident.

6. Tom (see) ..saw....a serious accident while he (stand)was standing at the bus stop.

7. The children (play) ..were playing...football when their mother (come) ...came ... back home.

8. The bell (ring)rang while Tom (take) was taking a bath.

9. He (sit)was sitting in a car when I (see)saw him.

10. We (clean) were cleaning the house when she (come) came yesterday.

Exercise 4: Past Perfect Continuous or Past Simple? Chia động từ ở thì quá khứ hoàn thành tiếp diễn hoặc quá khứ đơn. Chú ý thì của hai động từ trong một câu là khác nhau. 1. I (wait)____________________ for hours so I was really glad when the bus finally (arrive)____________________.2. Why (be)____________________ the baby's face so dirty? He (eat)____________________ chocolate.3. I (see)____________________ John yesterday, but he (run)____________________ so he was...
Đọc tiếp

Exercise 4: Past Perfect Continuous or Past Simple? Chia

động từ ở thì quá khứ hoàn thành tiếp diễn hoặc quá khứ

đơn. Chú ý thì của hai động từ trong một câu là khác nhau.

1. I (wait)____________________ for hours so I was really glad when the bus finally (arrive)____________________.

2. Why (be)____________________ the baby's face so dirty? He (eat)____________________ chocolate.

3. I (see)____________________ John yesterday, but he (run)____________________ so he was too tired to chat.

4. It (rain)____________________ and the pavement (be)____________________ covered with puddles.

5. When I (arrive)____________________ it was clear she (work)____________________. There were papers all over the floor and books everywhere.

6. They (study)____________________ all day so when we (meet)____________________ they were exhausted.

7. The boss (talk)____________________ to clients on Skype for hours so she (want)____________________ a break.

8. I (drink)____________________ coffee all morning. By lunchtime, I

(feel)____________________ really strange!

9. Lucy (hope)____________________ for a new car, so she was really pleased when she (get)____________________ one.

10. I (dream)____________________ about a holiday in Greece. I couldn't believe it when my husband (book)____________________ one as a surprise!

1
2 tháng 8 2021

Exercise 4: Past Perfect Continuous or Past Simple? Chia

động từ ở thì quá khứ hoàn thành tiếp diễn hoặc quá khứ

đơn. Chú ý thì của hai động từ trong một câu là khác nhau.

1. I (wait)________HAD BEEN WAITING____________ for hours so I was really glad when the bus finally (arrive)_____ARRIVED_______________.

2. Why (be)_________WAS___________ the baby's face so dirty? He (eat)___________ATE_________ chocolate.

3. I (see)_______SAW_____________ John yesterday, but he (run)________HAD BEEN RUNNING____________ so he was too tired to chat.

4. It (rain)_____HAD BEEN RAINING_______________ and the pavement (be)______WAS______________ covered with puddles.

5. When I (arrive)______ARRIVED______________ it was clear she (work)_______HAD BEEN WORKING_____________. There were papers all over the floor and books everywhere.

6. They (study)_______HAD  BEEN STUDYING_____________ all day so when we (meet)________MET____________ they were exhausted.

7. The boss (talk)_______HAD BEEN TALKING_____________ to clients on Skype for hours so she (want)____WANTED________________ a break.

8. I (drink)__________HAD BEEN DRINKING__________ coffee all morning. By lunchtime, I

(feel)________FELT____________ really strange!

9. Lucy (hope)_____HOPED_______________ for a new car, so she was really pleased when she (get)_______GOT_____________ one.

10. I (dream)__________DREAMT__________ about a holiday in Greece. I couldn't believe it when my husband (book)_____BOOKED_______________ one as a surprise!

Chia động từ ở thì quá khứ đơn và thì quá khứ tiếp diễn: In my last holiday, I went to Hawaii. When I 1(go)............. to the beach for the first time, something wonderful happened. I 2(swim) .............. in the sea while my mother was sleeping in the sun. My brother was building a castle and my father 3(drink)............. some water. Suddenly I 4.(see)............. a boy on the beach. His eyes were blue like the water in the sea and his hair 5(be) .............. beautiful...
Đọc tiếp

Chia động từ ở thì quá khứ đơn và thì quá khứ tiếp diễn:

 In my last holiday, I went to Hawaii. When I 1(go)............. to the beach for the first time, something wonderful happened. I 2(swim) .............. in the sea while my mother was sleeping in the sun. My brother was building a castle and my father 3(drink)............. some water. Suddenly I 4.(see)............. a boy on the beach. His eyes were blue like the water in the sea and his hair 5(be) .............. beautiful black. He was very tall and thin and his face was brown. My heart 6(beat).......... fast. I 7.(ask)........... him for his name with a shy voice. He 8.(tell)............ me that his name was John. He 9.(stay) ........... with me the whole afternoon. In the evening, we met again. We ate pizza in a restaurant. The following days we 10(have) ............... a lot of fun together. At the end of my holidays when I left Hawaii I said good-bye to John. We had tears in our eyes. He wrote to me a letter very soon and I answered him.

3
11 tháng 3 2021

Chia động từ ở thì quá khứ đơn và thì quá khứ tiếp diễn:

 In my last holiday, I went to Hawaii. When I 1(go).....went........ to the beach for the first time, something wonderful happened. I 2(swim) ......was swimming........ in the sea while my mother was sleeping in the sun. My brother was building a castle and my father 3(drink)....was drinking......... some water. Suddenly I 4.(see).........saw.... a boy on the beach. His eyes were blue like the water in the sea and his hair 5(be) ..........was.... beautiful black. He was very tall and thin and his face was brown. My heart 6(beat)......was beating.... fast. I 7.(ask).....asked...... him for his name with a shy voice. He 8.(tell)...told......... me that his name was John. He 9.(stay) ....stayed....... with me the whole afternoon. In the evening, we met again. We ate pizza in a restaurant. The following days we 10(have) .........had...... a lot of fun together. At the end of my holidays when I left Hawaii I said good-bye to John. We had tears in our eyes. He wrote to me a letter very soon and I answered him.

11 tháng 3 2021

1 went

2 was swimming

3 was drinking

4saw

5 was

6beated

7 asked

8 told

9 stayed

10 had

Exercise 1: Past Simple or Past Continuous? Chia động từ ở thì quá khứ đơn hoặc quá khứ tiếp diễn cho phù hợp 1. I (sit)____________________ in a cafe when you (call)____________________ .2. When you (arrive)____________________ at the party, who (be)____________________ there?3. Susie (watch)____________________ a film when she (hear)____________________ the noise.4. Yesterday I (go)____________________ to the library, next I (have)____________________ a swim, later I...
Đọc tiếp

Exercise 1: Past Simple or Past Continuous? Chia động từ ở thì quá

khứ đơn hoặc quá khứ tiếp diễn cho phù hợp

1. I (sit)____________________ in a cafe when you (call)____________________ .

2. When you (arrive)____________________ at the party, who (be)____________________ there?

3. Susie (watch)____________________ a film when she (hear)____________________ the noise.

4. Yesterday I (go)____________________ to the library, next I (have)____________________ a swim, later I (meet) Julie for coffee.

5. We (play)____________________ tennis when John (hurt)____________________ his ankle.

6. What (they/do)____________________ at 10pm last night - it was really noisy?

7. He (take)____________________ a shower when the telephone (ring)____________________.

8. He (be)____________________ in the shower when the telephone (ring)____________________.

9. When I (walk)____________________ into the room, everyone (work)____________________.

10. It (be)____________________ a day last September. The sun (shine)_____________ and the birds (sing)_________________ . I (walk)____________________ along the street when I (meet)____________________ an old friend.

11. He (live)____________________ in Russia when the Revolution (start)____________________.

12. When her train (get)____________________ to the station, we (wait) on the platform.

13. He (be)____________________ so annoying! He (always leave)____________________ his things everywhere.

14. On holiday we (visit)____________________ Rome, (see)____________________ the Vatican, and (spend)____________________ a few days at the beach.

15. Why (stand)____________________ on a chair when I (come)____________________ into the room?16. They (live)____________________ in Germany when they (be)__________ young.

17. At 7pm yesterday, we (listen)____________________ to music.

18. When I (leave)____________________ the house, it (snow)____________________.

19. He (work)____________________ in a bank when he (meet)____________________ his wife.

20. What (you/do)____________________ when I (call)____________________ you last night?

1
13 tháng 8 2021

Tham khảp

1. I was sitting in a café when you called.

2. When you arrived at the party, who was there?

3. Susie was watching a film when she heard the noise.

4. Yesterday I went to the library, next I had a swim, later I met Julie for a coffee.
5. We were playing tennis when John hurt his ankle.
6. What were they doing at 10pm last night? It was really noisy. 

7. He was taking a shower when the telephone rang. 

8. He was in the shower when the telephone rang. 

9. When I walked into the room, everyone was working. 

10. . It was a day last September. The sun was shining, the birds were singing. I
was walking along the street when I met an old friend. 
11. He was living in Russia when the Revolution started.

12. When her train got to the station, we were waiting on the platform. 

13. He was so annoying! He was always leaving his things everywhere. 

14.  On holiday we visited Rome, saw the Vatican, and spent a few days at the
beach. 

15. Why were you standing on a chair when I came into the room? 

16. They lived in Germany when they were young. 

17. At 7pm yesterday, we were listening to music.

18. When I left the house, it was snowing.

19. He was working in a bank when he met his wife.

20 What were you doing when I called you last night

4 tháng 5 2022

tham khảo:

https://topicanative.edu.vn/thi-qua-khu-don/

4 tháng 5 2022

(+): Khẳng định

\(S+V_{2/ed}+O.....\)

(-): Phủ định

\(S+didn't+V_0+O....\)

(?): Nghi vấn

\(Did+S+V_0+O....?\)

2 tháng 9 2019

thì nhìn ở cách chia động từ và trạng từ chỉ thời gian của nó thui

2 tháng 9 2019

Thì quá khứ đơn và thì quá khứ tiếp diễn (The past simple and The past continuous)

Quá khứ đơn và Quá khứ tiếp diễn là hai thì cơ bản nhưng rất quan trọng để hình thành nên những câu nói đơn giản cũng như hữu ích trong quá trình đọc hiểu.

Để học tốt thì Quá khứ đơn, các bạn phải nắm chắc bảng động từ bất quy tắc cơ bản cũng như cách thêm đuôi “ing” vào động từ trong thì Quá khứ tiếp diễn.

thi qua khu don va qua khu tiep dien, bai tap tieng anh, tai lieu tieng anh, cach chia thi, thi trong tieng anh, thi qua khu don, thi qua khu tiep dien, tieng anh, hoc tieng anh, bai tap tieng anh, tieng anh

Sau đây là một số so sánh sự khác nhau của 2 thì. Bên cạnh đó, tôi lưu ý các bạn cần chú ý phần Signal Words-một phần rất quan trọng giúp nhận biết dấu hiệu ra đề về 2 thì này trong học Toeic.

Dạng thức Thì quá khứ đơn và thì quá khứ tiếp diễn

THÌ QUÁ KHỨ ĐƠN

THÌ QUÁ KHỨ TIẾP DIỄN

1. To be:

S+Was/Were + Adj/ Noun

Ex:

- She was a charming actress

- They were renowned scientists

2. Verbs:

S+V quá khứ

Ex:

- I started studying English when I was 6 years old

- They invented the light bulb on their own

1. Công thức chung

S+Was/Were+V-ing

Ex:

- I was playing sports when my mom came home

- She was reading at this time last night







 


Chức năng Thì quá khứ đơn và thì quá khứ tiếp diễn

THÌ QUÁ KHỨ ĐƠN

THÌ QUÁ KHỨ TIẾP DIỄN

1. Diễn đạt một hành động xảy ra và chấm dứt hoàn toàn trong quá khứ

Ex:

Dickens wrote Oliver Twist

2. Diễn đạt các hành động xảy ra liên tiếp trong quá khứ

Ex:

She came home, switched on the computer and checked her e-mails.

3. Được sử dụng trong một số công thức sau:

- I used to ridebicycle to school (thói quen trong quá khứ)

- I was eating dinner when she came

-If I were you,I wouldn't get engaged to him (Câu điều kiện loại II)

4. Signal Words:

Last night/ year/month; yesterday, 2 years ago; in 1999..

1. Diễn đạt một hành động đang xảy ra tại một thời điểm trong quá khứ

Ex:

What were you doing at 8:30 last night?

2. Diễn đạt hai hành động xảy ra song song nhau trong quá khứ

Ex:

While my dad was reading a magazine, my mum was cooking dinner

3. Được sử dụng trong một số cấu trúc sau

- I saw Henrywhilehe was walkingin the park

- I was listening to the newswhen she phoned (một hành động đang xảy ra thì hành động khác chen ngang)

4. Signal Words:

At this time last night; at this moment last year; at 8 p.m last night; while...


Bài tập so sánh thì Quá khứ đơn và thì Quá khứ tiếp diễn

1. I (be)___ a student in Moloxop School in 1998.

A. Was
B. Were
C. To be
D. To was

2. A number of (duck) ___ (go) ___ through here, yesterday .

A. duck/go
B. ducks/go
C. ducks/went
D. duck/went

3. While Tom (play)…… the piano, his mother was doing the washing-up.

A. Was playing
B. Were playing
C. Played
D. Play

4. He (drink) some juice and then he ate a few chips.

A. Drink
B. Drank
C. Was drink
D. Were drink

5. I (have) dinner when I suddenly heard  a loud bang.
A. Was having
B. Were having
C. Had
D. Having

6. I last (see)___ her at her house two ____ ago.

A. Saw/year
B. Seen/weeks
C. see/months
D. saw/months

7. She (Win) ___ the gold medal in 1986.

A. win
B. won
C. to won
D. A,B,C

8. He had taught in this school before he ( leave)____ for London.

A. left
B. leave
C. leaving
D. had left

9. I didn't (see) ___you before.

A. see
B. saw
C. seeing
D. see

10. The poor not (have)___money.

A. have
B. has
C. had
D. have not


11. When Jane was doing  a language course in Ireland, she (visit) Blarney Castle.
A. Visted
B. Visting
C. Visit
D. Vists

12. When I (be) on my way home, I saw an accident.

A. Were
B. Was
C. Is
D. be


13. What you (do) ______ last night?
- I (do) ______ my homework.

A. do/does
B. do/do
C. do/did
D. did/did

14. He () tomatoes before. But, i eating its now 

A.
B. d
C. didn't d
D. didn't

15. I (study) French when I was a child.

A. studies
B. study
C. studied
D. were study

16. When my father was working  in the garden, an old friend (pass) by to see him.

A. Pass
B. Passed
C. Passing
D. Was passed

17. When it (start) to rain, our dog wanted to come inside.

A. Start
B. Started
C. Was starting
D. Was strated

18. I (not / understand) what they were talking about.

A. Did not understand
B. Not understand
C. Do not understand
D. Does not understand

22 tháng 2 2022

khocroi

Exercise 2: Past Simple or Past Continuous? Chia động từ ở thì quá khứ đơn hoặc quá khứ tiếp diễn cho phù hợp 1. We (eat)____________________ dinner at 8pm last night (we started eatingat 7:30).2. Yesterday I (go)____________________ to the Post Office,(buy)____________________ some fruit at the supermarket and(read)____________________ a book in the park in the afternoon.3. We (watch)____________________ TV when we (hear)____________________ aloud noise.4. Julie...
Đọc tiếp

Exercise 2: Past Simple or Past Continuous? Chia động từ ở

thì quá khứ đơn hoặc quá khứ tiếp diễn cho phù hợp

1. We (eat)____________________ dinner at 8pm last night (we started eating

at 7:30).

2. Yesterday I (go)____________________ to the Post Office,

(buy)____________________ some fruit at the supermarket and

(read)____________________ a book in the park in the afternoon.

3. We (watch)____________________ TV when we (hear)____________________ a

loud noise.

4. Julie (be)____________________ in the garden when Laurence

(arrive)____________________.

5. A: What (do)____________________ at 3pm yesterday?

B: I (clean)____________________ my house.

6. Last year I (visit)____________________ Paris and Rome.

7. They (have)____________________ dinner when the police

(come)____________________ to the door.

8. He (work)____________________ in the garden when he

(find)____________________ the money.

9. Laura (study)____________________ at 11pm last night.

10. He (sleep)____________________ when the doorbell

(ring)____________________.

11. I (walk)____________________ along the road when I

12. (meet)____________________ an old friend.13. It (be)____________________ a day in December. Snow

(fall)____________________ , children (sing)____________________ carols and

people (do)____________________ their Christmas shopping.

14. My ex-boyfriend (be)____________________ so annoying! He (always

miss)____________________ the bus and arriving late.

15. When I (call)____________________ Julie, she (work)____________________.

16. Why (cry)____________________ when I (arrive)____________________?

17. When he (get)____________________ home we started to eat dinner.

18. At 10 am yesterday, I (sit)____________________ on a bus.

19. I (enjoy)____________________ my book so much that I

(not/notice)____________________ that the train had stopped.

20. David (not/sleep)____________________ when I (arrive)____________________ ,

he (study)____________________ .

21. Mr Black (not/work)____________________ in the garden at 10pm last night.

 

1
29 tháng 7 2021

Exercise 2: Past Simple or Past Continuous? Chia động từ ở

thì quá khứ đơn hoặc quá khứ tiếp diễn cho phù hợp

1. We (eat)_________were eating___________ dinner at 8pm last night (we started eating

at 7:30).

2. Yesterday I (go)______went______________ to the Post Office,

(buy)_____________bought_______ some fruit at the supermarket and

(read)__________read__________ a book in the park in the afternoon.

3. We (watch)______were watching______________ TV when we (hear)____________heard________ a

loud noise.

4. Julie (be)_________was___________ in the garden when Laurence

(arrive)_________arrive___________.

5. A: What (do)_________were you doing___________ at 3pm yesterday?

B: I (clean)__________was cleaning__________ my house.

6. Last year I (visit)______visited______________ Paris and Rome.

7. They (have)__________were having__________ dinner when the police

(come)___________came_________ to the door.

8. He (work)________was working____________ in the garden when he

(find)___________found_________ the money.

9. Laura (study)________was studying____________ at 11pm last night.

10. He (sleep)_________was sleeping___________ when the doorbell

(ring)__________rang__________.

11. I (walk)_________was walking___________ along the road when I

12. (meet)___________met_________ an old friend.

13. It (be)_____________was_______ a day in December. Snow

(fall)____________was falling________ , children (sing)_________were singing___________ carols and

people (do)________were doing____________ their Christmas shopping.

14. My ex-boyfriend (be)_______was_____________ so annoying! He (always

miss)_______was always missing_____________ the bus and arriving late.

15. When I (call)_______called_____________ Julie, she (work)_________was working___________.

16. Why (cry)___________were you crying_________ when I (arrive)__________arrived__________?

17. When he (get)_____got_______________ home we started to eat dinner.

18. At 10 am yesterday, I (sit)________was sitting____________ on a bus.

19. I (enjoy)___________was enjoying_________ my book so much that I

(not/notice)_______didn't notice_____________ that the train had stopped.

20. David (not/sleep)________wasn't sleeping____________ when I (arrive)_________arrived___________ ,

he (study)________was studying____________ .

21. Mr Black (not/work)_____wasn't working_______________ in the garden at 10pm last night.