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17 tháng 12 2020

change into passive voice 

1.farmers have cut down more and more trees for wood 

More and more trees have been cut down by farmers for wood.

2.the children have washed and dried their hands on a towel 

Their hands have been washed and dried by  the children on a towel 

3. my son has spilt some ink on the carpet 

Some ink have been split by my son on the carpet 

4. he has just shown her how to do it 

She has just been shown how to do it 

5. nobody has ever treated the child with such kindness before

The child hasn't ever been treated with such kindness before.

17 tháng 12 2020

change into passive voice 

1.farmers have cut down more and more trees for wood 

More and more trees have been cut down by farmers for wood.

2.the children have washed and dried their hands on a towel 

Their hands have been washed and dried by  the children on a towel 

3. my son has spilt some ink on the carpet 

Some ink have been split by my son on the carpet 

4. he has just shown her how to do it 

Rewrite each of the sentences , beginning as shown , so that the meaning stays the same . 1/ Their game of badminton is always on Saturday . \(\Rightarrow\) They 2/ We have learned English for 4 years . \(\Rightarrow\) We started 3/ He never goes to school late . \(\Rightarrow\) He is 4/ Somebody has just cleaned the room . \(\Rightarrow\) The room 5/ They have built a new house in our town . \(\Rightarrow\) A new house 6/ He gets a good result in examination . This makes his...
Đọc tiếp

Rewrite each of the sentences , beginning as shown , so that the meaning stays the same .

1/ Their game of badminton is always on Saturday .

\(\Rightarrow\) They

2/ We have learned English for 4 years .

\(\Rightarrow\) We started

3/ He never goes to school late .

\(\Rightarrow\) He is

4/ Somebody has just cleaned the room .

\(\Rightarrow\) The room

5/ They have built a new house in our town .

\(\Rightarrow\) A new house

6/ He gets a good result in examination . This makes his parents pleased ( using which as a connector)

\(\Rightarrow\)

7/ They lived in Nottingham a few years ago , but now they are living in Manchester . ( using used to )

\(\Rightarrow\)

8/ Geogre heard the noise . Then he came downstairs quickly .

\(\Rightarrow\) After

9/ The street is very noisy . This makes difficult to sleep .( Which as connector )

\(\Rightarrow\)

10/ They have washed their hands on a towel .

\(\Rightarrow\) Their hands

11/ Nobody has invited her to the party . ( change into passive voice )

\(\Rightarrow\) She

12/ Has someone decorated my bedroom ? ( change into passive voice )

\(\Rightarrow\) Has my bedroom

HELP ME !!!!!!!!!

2
8 tháng 11 2018

Rewrite each of the sentences , beginning as shown , so that the meaning stays the same .

1/ Their game of badminton is always on Saturday .

⇒⇒ They ALWAYS PLAY BADMINTON ON SATURDAY

2/ We have learned English for 4 years .

⇒⇒ We started LEARNING English 4 years AGO

3/ He never goes to school late .

⇒⇒ He is ALWAYS LATE FOR SCHOOL

4/ Somebody has just cleaned the room .

⇒⇒ The room HAS JUST BEEN CLEANED

5/ They have built a new house in our town .

⇒⇒ A new house HAS BEEN BUILT in our town

6/ He gets a good result in examination . This makes his parents pleased ( using which as a connector)

⇒⇒ He gets a good result in examination WHICH makes his parents pleased

7/ They lived in Nottingham a few years ago , but now they are living in Manchester . ( using used to )

⇒⇒ THEY USED TO LIVE in Nottingham a few years ago

8/ Geogre heard the noise . Then he came downstairs quickly .

⇒⇒ After HEARING THE NOISE, GEOGRE came downstairs quickly

9/ The street is very noisy . This makes difficult to sleep .( Which as connector )

⇒⇒The street is very noisy WHICH makes difficult to sleep .

10/ They have washed their hands on a towel .

⇒⇒ Their hands HAVE BEEN WASHED ON A TOWEL

11/ Nobody has invited her to the party . ( change into passive voice )

⇒⇒ She HASN'T BEEN INVITED TO THE PARTY

12/ Has someone decorated my bedroom ? ( change into passive voice )

⇒⇒ Has my bedroom BEEN decorated?

8 tháng 11 2018

Rewrite each of the sentences , beginning as shown , so that the meaning stays the same .

1/ Their game of badminton is always on Saturday .

⇒⇒ They always play badminton on saturday

2/ We have learned English for 4 years .

⇒⇒ We started learning english 4 years ago

3/ He never goes to school late .

⇒⇒ He is always on time for school

4/ Somebody has just cleaned the room .

⇒⇒ The room has just been cleaned

5/ They have built a new house in our town .

⇒⇒ A new house has been built in our town

6/ He gets a good result in examination . This makes his parents pleased ( using which as a connector)

⇒⇒He gets a good result in examination which makes his parents pleased

7/ They lived in Nottingham a few years ago , but now they are living in Manchester . ( using used to )

⇒⇒they used to live in Nottingham a few years ago

8/ Geogre heard the noise . Then he came downstairs quickly .

⇒⇒ After hearing the noise, he came downstairs quickly

9/ The street is very noisy . This makes difficult to sleep .( Which as connector )

⇒⇒The street is very noisy which makes difficult to sleep

10/ They have washed their hands on a towel .

⇒⇒ Their hands have been washed on a towel

11/ Nobody has invited her to the party . ( change into passive voice )

⇒⇒ She hasn't been invited to the party

12/ Has someone decorated my bedroom ? ( change into passive voice )

⇒⇒ Has my bedroom been decorated?

27 tháng 1 2019

change into passive voice using the present simple tense

1,nam is repairing my radio at the moment

my radio........is being repaired by Nam at the moment .......

2,someone is cutting the grass in the garden at the moment

the grass....is being cut in the garden at the moment.....

3,the factory is producing more and more pollution

more and more pollution...........is being produced by the factory....

4,the wind blew two big trees down

two big trees...........were blown down by the wind.......

27 tháng 1 2019

change into passive voice using the present simple tense

1,nam is repairing my radio at the moment

my radio is being repaired by Nam at the moment

2,someone is cutting the grass in the garden at the moment

the grass is being cut in the garden at the moment

3,the factory is producing more and more pollution

more and more pollution is being produced by the factory

4,the wind blew two big trees down

two big trees were blown down by the wind

5,

15 tháng 5 2020

Turn these sentences into passive voice

1. Some body cleans the room every day

=> The room is cleaned everyday.

2. People play football all over the word

=> Football is played all over the world.

3. People don't use this road very often

=> This road isn't used very often.

4. My sister cooks dinner very well

=> Dinner is cooked very well by my sister.

5. He has cut those trees for two hours

=> Those trees have been cut for two hours.

6. The fire has destroyed the forest

=> The forest has been destroyed by the fire.

7. I have just sent a letter

=> A letter has just been sent.

8. Have you tided the kitchen?

=> Has the kitchen been tided ?

9. They have just given the children some gifts

=> The children have just been given some gifts.

10. We haven't moved anything since you left here

=> Anything hasn't been moved since you left here.

11. My mother has promised me a bike if i pass the exam

=> I have been promised a bike by my mother if I pass the exam.

12. Someone has given 1000 dollars to the charity

=> 1000 dollars has been given to the charity.

15 tháng 5 2020

Em cảm ơn ạ

1 tháng 11 2020

II. Rewrite these sentence: Change into passive voice

5. She has done her homework in her room for 2 hours.

=> Her homework has been done in her room for 2 hours.

6. They have built a lot of new roads since 2010

=> A lot of new roads have been built since 2010.

7. Mary and Lyly have washed the dishes in the kitchen so far.

=> The dishes have been washed in the kitchen by Mary and Lyly so far.

8. Peter has written three books so far.

=> Three books have been written by Peter so far.

9. My mom has made some new dresses for 2 days.

=> Some new dresses have been made by my mom for 2 days.

Read the passage below and choose the best answer among A, B, C or D for each question :Once there were lots of pandas in the mountains of Western China. Today they are becoming extinct. The reason is that they cannot find enough food. Pandas eat bamboo leaves. They do not like another food. The bamboo grows very slowly. It can take 10 years for a bamboo to grow from a seed to a big plant. Some types of bamboo have seeds only once every 60 years. Pandas must wait many years for their food to...
Đọc tiếp

Read the passage below and choose the best answer among A, B, C or D for each question :

Once there were lots of pandas in the mountains of Western China. Today they are becoming extinct. The reason is that they cannot find enough food. Pandas eat bamboo leaves. They do not like another food. The bamboo grows very slowly. It can take 10 years for a bamboo to grow from a seed to a big plant. Some types of bamboo have seeds only once every 60 years. Pandas must wait many years for their food to grow. While the bamboo is growing, pandas do not have enough leaves to eat.

Farmers are using more and more of the land on the mountain side to grow food for man. The farmers cut down the bamboo. Bamboo leaves become less plentiful. Pandas can not find enough food to eat. They starve and die.

China and World Wildlife Fund (WWF) are trying to save the pandas. In 1979 they began to set up special parks where pandas live. Once such park is the Wolong Reserve in Sichuan. The Wolong Reserve has the highest number of pandas in the world. Scientists come here to study the panda’s eating and mating habits. By learning more about panda’s habits, scientists can save it from extinction.

Question: Why do farmers cut down bamboo trees ?

ATo get food for pandas

B. To drive pandas away

CTo make pandas starve and die

D. To get farm land

1
17 tháng 11 2019

Đáp án: D

1. John has just driven them to the hospital.(Passive voice) => 2.they have just built a new primary school in this area.(Passive voice) => 3. The teacher has told me about the changes of the timetable.(Passive voice) => 4. Nobody has used the building before. (Hasn't) => 5. Has someone decorated my dinning room?(Passive voice) => 6.people have discovered a new source of energy.(Passive voice) => 7.people have changed the method of teaching languages since 1998.(Passive voice) => 8. They have...
Đọc tiếp

1. John has just driven them to the hospital.(Passive voice)
=>
2.they have just built a new primary school in this area.(Passive voice)
=>
3. The teacher has told me about the changes of the timetable.(Passive voice)
=>
4. Nobody has used the building before. (Hasn't)
=>
5. Has someone decorated my dinning room?(Passive voice)
=>
6.people have discovered a new source of energy.(Passive voice)
=>
7.people have changed the method of teaching languages since 1998.(Passive voice)
=>
8. They have already a new bridge over the canal(Passive voice)
=>
9. They don't go to the church every sunday any longer. (Used to)
=>
10. My father smoked a lot of cigarettes a day, but now he gives up smoking. (Used to)
=>
11. We often went fishing on this river we were small children. (Used to)
=>
12.he ate a lot of candies when he was a child. (Used to)
=>
13.he took a great interest in photography. (Used to)
14. Phong did his homework VERY QUICKLY. (Make question for the underlined phrase)
=>
15.he bought the laptop at the super market. (Make question for the underlined phrase)
=>
16.i didn't write her BEACAUSE I DIDN'T HAVE HER ADDRESS. (Make question for the underlined phrase)
=>
17.Many and long are studing CHEMIST AND GEOGRAPHY now. (Make question for the underlined phrase)
=>
18.Mai did her morning exercise IN THE YARD. (Make question for the underlined phrase)
=>
19. She has THREE BROTHERS. (Make question for the underlined phrase)
=>
20.My mother goes shopping TWICE A WEEK. (Make question for the underlined phrase)
=>
21. He went to school ON FOOT. (Make question for the underlined phrase)
=>
22. They no longer played teenis.
=>They used
23. Mr. Vy drank some lemonade.
=>What
24. My father has taught Physisc at Chu Van An school for two years.
=>Physics
25. They have cancelled the meeting.
=> The
26.They have already sent two million books to the America.
=> Two
27. No one has used this computer for a long time.
=>
28. They have taken her to hospital.
=>

1
31 tháng 10 2019

1. John has just driven them to the hospital.(Passive voice)
=> They have just been driven to the hospital by John
2.they have just built a new primary school in this area.(Passive voice)
=> a new primary school has just been built in this area
3. The teacher has told me about the changes of the timetable.(Passive voice)
=> I have been told about the changes of the timetable by the teacher
4. Nobody has used the building before. (Hasn't)
=> the building hasn't been used before
5. Has someone decorated my dinning room?(Passive voice)
=> Has my dinning room been decorated ?
6.people have discovered a new source of energy.(Passive voice)
=> a new source of energy has been discovered
7.people have changed the method of teaching languages since 1998.(Passive voice)
=> the method of teaching languages has been changed since 1998.


8. They have already built a new bridge over the canal(Passive voice)
=> a new bridge has already been built over the canal
9. They don't go to the church every sunday any longer. (Used to)
=> They used to go to the church every sunday
10. My father smoked a lot of cigarettes a day, but now he gives up smoking. (Used to)
=> My father used to smoke a lot of cigarettes a day, but now he gives up smoking.
11. We often went fishing on this river we were small children. (Used to)
=> We used to go fishing on this river we were small children.
12.he ate a lot of candies when he was a child. (Used to)
=> He used to eat a lot of candies when he was a child.
13.he took a great interest in photography. (Used to)

He used to take a great interest in photography.
14. Phong did his homework VERY QUICKLY. (Make question for the underlined phrase)
=> How did Phong do his homework ?
15.he bought the laptop at the super market. (Make question for the underlined phrase) ( gạch ở đâu ? )
16.i didn't write her BEACAUSE I DIDN'T HAVE HER ADDRESS. (Make question for the underlined phrase)
=> Why didn't you write her ?
17.Many and long are studing CHEMIST AND GEOGRAPHY now. (Make question for the underlined phrase)
=> What subjects are Many and long studying now ?
18.Mai did her morning exercise IN THE YARD. (Make question for the underlined phrase)
=> Where did Mai do her morning exercise
19. She has THREE BROTHERS. (Make question for the underlined phrase)
=> What does she have ?
20.My mother goes shopping TWICE A WEEK. (Make question for the underlined phrase)
=> How often does your mother go shopping ?
21. He went to school ON FOOT. (Make question for the underlined phrase)
=> How did he go to school ?
22. They no longer played teenis.
=>They used to play tennis
23. Mr. Vy drank some lemonade.
=>What did Mr Vy drink ?
24. My father has taught Physisc at Chu Van An school for two years.
=>Physics has been taught at Chu Van An school by my father for two years.
25. They have cancelled the meeting.
=> The meeting has been cancelled
26.They have already sent two million books to the America.
=> Two million books have been sent to the America.
27. No one has used this computer for a long time.
=> this computer hasn't been used for a long time.
28. They have taken her to hospital.

She has been taken to hospital

#Yumi

31 tháng 10 2019

Câu 15: he bought the loptop AT THE SUPER MARKET. (make question for the underlined phrase)

III. Correct a mistake1. It is very unpleasant waking up and hear the rain beating on the windows.2. When I met him this morning he has invited me to dinner with his family this Sunday.3. More and more trees cut down to make paper and to build houses.4. Information in a computer can be lost because it is not longer stored or it cannot be retrieved.5. During I was talking to Barbara, I learned that Tony was in hospital.6. I heard someone call my name while I had lunch in the restaurant.7. I just...
Đọc tiếp

III. Correct a mistake

1. It is very unpleasant waking up and hear the rain beating on the windows.

2. When I met him this morning he has invited me to dinner with his family this Sunday.

3. More and more trees cut down to make paper and to build houses.

4. Information in a computer can be lost because it is not longer stored or it cannot be retrieved.

5. During I was talking to Barbara, I learned that Tony was in hospital.

6. I heard someone call my name while I had lunch in the restaurant.

7. I just can’t understand what you have said so could you please repeat it again?

8. It's sometimes difficult to solve the problems among the old and the young.

9. I advised my sister putting her money under her pillow.

10. You had better than read the questions carefully before making your choice.

IV.1. It’s time we (go). If we (not leave) now, we (miss) the last bus home.

2. She (phone) me yesterday to invite me out but I (not want) to go because I (wait) for a call then.

3. If bacteria (stop) working, life on earth (come) to an end.

4. Why are you all laughing? Roger (tell) you his funny stories?

5. You (meet) Janet recently? Yes, I (talk) with her just this morning.

6. Your hair needs (cut); it (grow) too long now.

2
10 tháng 7 2021

1 waking => to wake

2 cut => are cut

3 not => no

4 During => while

5 had => was having

6 have => bỏ

7 among => between

8 than => bỏ

10 tháng 7 2021

1. It’s time we (go)went.If we (not leave) didn't leave now, we (miss) would miss the last bus home.

2. She (phone)phoned me yesterday to invite me out but I (not want)don't want to go because I (wait)am waiting for a call then.

3. If bacteria (stop)stopped working, life on earth (come) would come to an end.

4. Why are you all laughing?is  Roger (tell) tellingyou his funny stories?

5. have You (meet)met Janet recently? Yes, I (talk)have talked with her just this morning.

 

6. Your hair needs (cut)cutting; it (grow)is growing too long now.

 

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. Trees are useful to man in three very important ways: they provide him with wood and other products, they give him shade, and they help to prevent drought and floods. Unfortunately, in many parts of the world man has not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Trees are useful to man in three very important ways: they provide him with wood and other products, they give him shade, and they help to prevent drought and floods.

Unfortunately, in many parts of the world man has not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had.

Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It gained the empire but, without its trees, its soil became hard and poor. When the empire fell to pieces, the country found itself faced by floods and starvation.

Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this. The villager wants wood to cook his food with, and he can earn money by making charcoal or selling wood to the townsman. He is usually too lazy or too careless to plant and look after trees. So unless the government has a good system of control, or can educate the people, the forests will slowly disappear.

This does not only mean that there will be fewer trees. The results are even more serious. For where there are trees their roots break the soil up, allowing the rain to sink in and also bind the soil, thus preventing it being washed away easily, but where there are no trees, the soil becomes hard and poor. The rain falls on hard ground and flows away on the surface, causing floods and carrying away with it the rich topsoil, in which crops grow so well. When all the topsoil is gone, nothing remains but a worthless desert.

Trees are useful to man mainly in three ways, the most important of which is that they can _______.

A. keep him from the hot sunshine

B. make him draw quick profit from them

C. enable him to build warships

D. protect him from drought and floods

1
26 tháng 10 2017

Kiến thức: Đọc hiểu

Giải thích:

Cây cối rất hữu ích cho con người chủ yếu theo ba cách, trong đó quan trọng nhất là chúng có thể ______.

A. giữ con người tranh khỏi ánh nắng mặt trời nóng bức

B. làm cho con người kiếm được lợi nhuận nhanh chóng từ chúng

C. cho phép con người chế tạo tàu chiến

D. bảo vệ con người khỏi hạn hán và lũ lụt

Thông tin: Trees are useful to man in three very important ways: they provide him with wood and other products, they give him shade, and they help to prevent drought and floods.

Unfortunately, in many parts of the world man has not realized that the third of these services is the most important.

Tạm dịch: Cây xanh rất hữu ích cho con người theo ba cách rất quan trọng: chúng cung cấp cho một người gỗ và các sản phẩm khác, chúng cho người đó bóng mát, và giúp ngăn chặn hạn hán và lũ lụt.

Thật không may, ở nhiều nơi trên thế giới, con người đã không nhận ra rằng lợi ích thứ ba trong số đó là quan trọng nhất.

Chọn D

Dịch bài đọc:

Cây xanh rất hữu ích cho con người theo ba cách rất quan trọng: chúng cung cấp cho một người gỗ và các sản phẩm khác, chúng cho người đó bóng mát, và giúp ngăn chặn hạn hán và lũ lụt.

Thật không may, ở nhiều nơi trên thế giới, con người đã không nhận ra rằng lợi ích thứ ba trong số đó là quan trọng nhất. Trong sự háo hức của mình để thu được lợi nhuận nhanh chóng từ cây xanh, người ta đã chặt phá chúng với số lượng lớn, chỉ để thấy rằng không có chúng, người ta đã mất đi những người bạn thân nhất mà mình có.

Hai ngàn năm trước, một quốc gia giàu có và hùng mạnh đã chặt hạ cây cối của mình để chế tạo tàu chiến, để tự mình trở thành một đế chế. Nó đã giành được đế chế, nhưng không có cây cối, đất đai của nó trở nên khô cứng và bạc màu. Khi đế chế sụp đổ, đất nước này phải đối mặt với lũ lụt và nạn đói.

Mặc dù chính phủ nhận ra tầm quan trọng của nguồn cung cấp cây xanh dồi dào, thật khó để thuyết phục người dân nhìn thấy điều này. Dân làng cần gỗ để nấu thức ăn của mình và người đó có thể kiếm tiền bằng cách đốt than hoặc bán gỗ cho người dân thị trấn. Anh ấy thường quá lười biếng hoặc quá bất cẩn để

trồng và chăm sóc cây. Vì vậy, trừ khi chính phủ có một hệ thống kiểm soát tốt, hoặc có thể giáo dục người dân, các khu rừng sẽ dần biến mất.

Điều này không chỉ có nghĩa là sẽ có ít cây cối hơn. Kết quả thậm chí còn nghiêm trọng hơn. Đối với những nơi có cây cối, rễ của chúng xới đất, cho phép nước mưa chìm xuống và liên kết đất, do đó ngăn chặn việc nó bị cuốn trôi một cách dễ dàng, nhưng nơi không có cây, đất trở nên khô cứng và bạc màu. Mưa rơi trên mặt đất cứng và chảy trên bề mặt, gây ra lũ lụt và mang theo lớp đất mặt màu mỡ, nơi mà cây trồng phát triển rất tốt. Khi tất cả lớp đất mặt đã biến mất, không còn gì ngoài một sa mạc vô giá trị.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. Trees are useful to man in three very important ways: they provide him with wood and other products, they give him shade, and they help to prevent drought and floods. Unfortunately, in many parts of the world man has not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Trees are useful to man in three very important ways: they provide him with wood and other products, they give him shade, and they help to prevent drought and floods.

Unfortunately, in many parts of the world man has not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had.

Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It gained the empire but, without its trees, its soil became hard and poor. When the empire fell to pieces, the country found itself faced by floods and starvation.

Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this. The villager wants wood to cook his food with, and he can earn money by making charcoal or selling wood to the townsman. He is usually too lazy or too careless to plant and look after trees. So unless the government has a good system of control, or can educate the people, the forests will slowly disappear.

This does not only mean that there will be fewer trees. The results are even more serious. For where there are trees their roots break the soil up, allowing the rain to sink in and also bind the soil, thus preventing it being washed away easily, but where there are no trees, the soil becomes hard and poor. The rain falls on hard ground and flows away on the surface, causing floods and carrying away with it the rich topsoil, in which crops grow so well. When all the topsoil is gone, nothing remains but a worthless desert.

It’s a great pity that in many places _______.

A. man is not eager to make profits from trees

B. man hasn’t found out that he has lost all trees

C. man hasn’t realised the importance of trees to him

D. man is only interested in building empire

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5 tháng 4 2019

Kiến thức: Đọc hiểu

Giải thích:

Thật đáng tiếc khi ở nhiều nơi, _______.

A. con người không thiết tha kiếm lợi nhuận từ cây xanh

B. con người chưa nhận thấy được rằng mình đã mất đi toàn bộ cây cối

C. con người chưa nhận ra tầm quan trọng của cây đối với mình

D. con người chỉ quan tâm đến việc xây dựng đế chế

Thông tin: Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this.

Tạm dịch: Mặc dù chính phủ nhận ra tầm quan trọng của nguồn cung cấp cây xanh dồi dào, thật khó để thuyết phục người dân nhìn thấy điều này.

Chọn C

Dịch bài đọc:

Cây xanh rất hữu ích cho con người theo ba cách rất quan trọng: chúng cung cấp cho một người gỗ và các sản phẩm khác, chúng cho người đó bóng mát, và giúp ngăn chặn hạn hán và lũ lụt.

Thật không may, ở nhiều nơi trên thế giới, con người đã không nhận ra rằng lợi ích thứ ba trong số đó là quan trọng nhất. Trong sự háo hức của mình để thu được lợi nhuận nhanh chóng từ cây xanh, người ta đã chặt phá chúng với số lượng lớn, chỉ để thấy rằng không có chúng, người ta đã mất đi những người bạn thân nhất mà mình có.

Hai ngàn năm trước, một quốc gia giàu có và hùng mạnh đã chặt hạ cây cối của mình để chế tạo tàu chiến, để tự mình trở thành một đế chế. Nó đã giành được đế chế, nhưng không có cây cối, đất đai của nó trở nên khô cứng và bạc màu. Khi đế chế sụp đổ, đất nước này phải đối mặt với lũ lụt và nạn đói.

Mặc dù chính phủ nhận ra tầm quan trọng của nguồn cung cấp cây xanh dồi dào, thật khó để thuyết phục người dân nhìn thấy điều này. Dân làng cần gỗ để nấu thức ăn của mình và người đó có thể kiếm tiền bằng cách đốt than hoặc bán gỗ cho người dân thị trấn. Anh ấy thường quá lười biếng hoặc quá bất cẩn để

trồng và chăm sóc cây. Vì vậy, trừ khi chính phủ có một hệ thống kiểm soát tốt, hoặc có thể giáo dục người dân, các khu rừng sẽ dần biến mất.

Điều này không chỉ có nghĩa là sẽ có ít cây cối hơn. Kết quả thậm chí còn nghiêm trọng hơn. Đối với những nơi có cây cối, rễ của chúng xới đất, cho phép nước mưa chìm xuống và liên kết đất, do đó ngăn chặn việc nó bị cuốn trôi một cách dễ dàng, nhưng nơi không có cây, đất trở nên khô cứng và bạc màu. Mưa rơi trên mặt đất cứng và chảy trên bề mặt, gây ra lũ lụt và mang theo lớp đất mặt màu mỡ, nơi mà cây trồng phát triển rất tốt. Khi tất cả lớp đất mặt đã biến mất, không còn gì ngoài một sa mạc vô giá trị.