Bài tập Tiếng Anh Lớp 8 Global Success theo unit - Unit 7: Environmental protection

 a) The roads were slippery when it rained
 b) As soon as they arrive, we’ll have lunch. 
 c) When I was 10 years old, my family moved to New York. 
d) My mom was cooking while my dad was talking on the phone. 
** Lưu ý: Mệnh đề trạng ngữ chỉ thời gian có thể đứng đầu hoặc cuối câu. Nếu mệnh đề trạng 
ngữ chỉ thời gian đứng ở đầu câu sẽ ngăn cách với mệnh đề chính bằng dấu phẩy.
 1. I will call you as soon as I arrive at the station.
 (As soon as I arrive at the station, I will call you.)
 2. After the tornado hit, there were only a few houses left standing.
 ( There were only a few houses left standing after the tornado hit. )
** Mệnh đề trạng ngữ chỉ thời gian chỉ thời điểm xảy ra sự việc. Nó thường được giới 
thiệu bởi các từ nối chỉ thời gian : before, after, when, while, till/ until, as soon as,...
1. when
 Eg: I was not at home when he came to see me yesterday.
2. while
 Eg: is reading a novel while Jack is reading a cartoon. 
3. as soon as 
 Eg: I will clean up the beach as soon as it stops raining.
4. before
 Eg: My father taught me how to use the computer before he bought one for me.
5. after
 Eg: I went straight to the gym after I left home )
6. till/ until
 Eg: You can stay here till/ until you find a suitable place to stay. 
REMEMBER: 
 A complex sentence contains one independent clause and at least one dependent 
clause.
Example: The roads were slippery when it rained . 
 independent clause (IC) dependent clause (DC)
- An adverb clause is a dependent clause.
- An adverb clause of time shows when something happens. It is usually introduced 
by time connectors: before, after, when, while, till/ until, as soon as,...
 Example: As soon as they arrive, we'll have lunch. 
 B. PRACTICE EXERCISES
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BÀI TẬP TIẾNG ANH 8 ( Global Success ) Unit 7: Environmental protection 10. We should avoid dumping _____________ into lakes and rivers to reduce water pollution. 
Exercise 3. Complete each of the sentences with a suitable word or phrase from the box. 
 Cutting down , species , habitat, Protecting , reduce, light pollution,
 planting, acid rain, technological changes , water pollution, 
1. The panda’s natural ______________ is the bamboo forest.
2. This forest provides a habitat for hundreds of ___________ of plants and animals.
3. By doing a simple thing like __________ a tree, we are making the world a better place for 
humans and all living things on earth.
4. __________ the environment must be the job of everyone in the community.
5. We should __________ the consumption of single-use products like plastic bottles and bags.
6. Polluted water from factories can be treated in sewage treatment plants to control ______ . 
7. __________ trees and burning forests destroy a lot of wildlife habitats.
8. Rain polluted by acid that has been realease into the atmosphere is known as __________ . 
9. The presence of unwanted or excessive artificial lighting is known as __________. 
10. The ___________ brought about by AI are drastically changing our lives. 
Exercise 4 : Choose the best answer A, B, C or D to complete the following sentences. 
1. I will call you before I ________ over.
 A. come B. will come C. will be coming D. came
2. After she graduates, she ________ a job.
 A. got B. will get C. had got D. get
3. When I _________ him tomorrow, I will ask him.
 A. saw B. have seen C. will see D. see
4. As soon as it _________ raining, we will leave.
 A. stop B. stops C. had stopped D. stopped
5. Whenever I ________ her, I say hello. 
 A. will have seen B. will see C. see D. saw
6. The next time I go to New York, I am going ________ a ballet.
 A. seeing B. see C. saw D. to see
7. By the time Bill ______ to bed tomorrow, he will have had a full day and will be ready for 
sleep.
 A. had gone B. will go C. goes D. went
8. As soon as I finish my report, I will call you and we ________ out for dinner.
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BÀI TẬP TIẾNG ANH 8 ( Global Success ) Unit 7: Environmental protection 8. We will wait for you outside the shopping centre until you _________ (be) back.
→ ___________________________________________________________________ .
9. Don't worry, Samantha. I'll watch you while you _________ (swim) in the lake.
→ ___________________________________________________________________ .
10. As soon as I _________ (be) in Mumbai, I'll get in touch with Mr. Amar Patel.
→ ___________________________________________________________________ .
Exercise 6 : Match the half sentence on the right with the half sentence on the left to 
make a TIME clause, and then write a complete sentence. ( Nối nửa câu ở bên phải với 
nửa câu bên trái để tạo thành mệnh đề chỉ thời gian , rồi viết thành câu hoàn chỉnh.)
 0. They were searching for information A. we went home by bus.
 for their project while .. B. going to bed.
 1. We should wait here until .. 
 C. you cross the street.
 2. As soon as they arrive, ..
 D. my sister was cooking dinner.
 3. After I finish putting these things away,
 4. Wherever you go,. E. we were in new interesting places. 
 5. While I was watering the flowers,. F. you should turn off all the lights.
 6. We had a hard time finding the way to our G. we’ll have lunch
 hotel when..
 H. the rain stops
 7. Before you leave your room, . 
 I. I’ll give you a hand.
 8. Remember to lock the door before..
 9. When we finished our picnic,  K. you can always find good people. 
 10. You must be careful when  L. their parents were gardening.
 1+ . 2+ . 3 +. 4 + . 5 + . 6 + . 7 + . 8 + . 9 + . 10 + . 
Example : 0 + L : They were searching for information for their project while their 
parents were gardening. 
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B. READING
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BÀI TẬP TIẾNG ANH 8 ( Global Success ) Unit 7: Environmental protection A. They prefer shops in big shopping centres outside of town.
B. Small shops near their homes have disappeared.
C. Many new shopping centres have appeared outside of town.
D. It has become popular to do shopping in large shopping centres.
3. How many examples are there in the passage of people reducing car use?
 A. Two.B. Three.C. Four.D. Five.
4. The word “improved” in the first paragraph probably means _________ .
 A. got worseB. reducedC. became better D. maintained
5. What is the best title for this passage? 
A. Reducing the Use of Cars in Britain. 
B. The Disadvantages of Cars. 
C. How People are Reducing Smog in Britain. 
D. Smog in Britain: Past and Present. 
C. WRITING: 
Exercise 1. Complete the following sentences, using the words and pharases given.
1. We / stayed/ the shelter/ till/ the storm / . 
→ ____________________________________________________________________ .
2. As soon as / they/ hear/ the crack sound ,/ they/ run / of the house / last week.
→ ____________________________________________________________________ .
3. We / should / finish / clean/ the house / before / mum / get home.
→ ____________________________________________________________________ .
4 . Don’t talk/ the driver/ while/ he / drive.
→ ____________________________________________________________________ .
5. While/ they/ surf/ the Internet,/ we/ saw/ calls for / joining programme/ save endangered 
species. 
→ ____________________________________________________________________ .
6. After / the Earth Hour / be/ over, / we / save / a lot of power.
→ ____________________________________________________________________ .
7. A fire started as soon as the boys / leave / campsite.
→ ____________________________________________________________________ .
8. You / should/ make / a shop/ list / before / you / go shopping.
→ ____________________________________________________________________ .
9. The villagers/ have / electricity/ until/ they / install / new generator.
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BÀI TẬP TIẾNG ANH 8 ( Global Success ) Unit 7: Environmental protection 5. My father taught me how to use the computer . Then he bought one for me. (before )
→ _____________________________________________________________________ .
6. I read my favourite book. Then I went to bed. (after) 
→ _____________________________________________________________________ .
7. Nick is reading a novel. Jack is reading a cartoon. (while ) 
→ _____________________________________________________________________ .
8. My sister makes a mess. My mum makes her weed the garden, (whenever) 
→ _____________________________________________________________________ .
9. The tornado hit. There were only a few houses left standing. (after)
→ _____________________________________________________________________ .
10 . The bell rang. Everyone raced out of the classroom . (when)
→ _____________________________________________________________________ .
Exercise 5 . Combine each pair of sentences, using the connector given. 
1. I arrive at the station. I will call you right after. (as soon as )
→ ____________________________________________________________________ .
2. We were planting trees. Our friends were collecting rubbish, (while)
→ ____________________________________________________________________ .
3. The choir practised for half an hour. After that, they went on stage, (before)
→ ____________________________________________________________________ .
4. We have to follow the steps. We make a conical hat.(when)
→ ____________________________________________________________________ .
5. My father taught me how to use the computer . Then he bought one for me. (before )
→ ____________________________________________________________________ .
6. I read my favourite book. Then I went to bed. (after)
→ ____________________________________________________________________ .
7. Nick is reading a novel. Jack is reading a cartoon. (while ) 
→ ____________________________________________________________________ .
8. My sister makes a mess. My mum makes her weed the garden, (whenever) 
→ ____________________________________________________________________ .
9. The tornado hit. There were only a few houses left standing. (after)
→ ____________________________________________________________________ .
10 . The bell rang. Everyone raced out of the classroom . (when)
→ ____________________________________________________________________ .
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BÀI TẬP TIẾNG ANH 8 ( Global Success ) Unit 7: Environmental protection – We stayed there until it stopped raining.
*Lưu ý: Mệnh đề trạng ngữ chỉ thời gian có thể đứng đầu hoặc cuối câu. Nếu mệnh đề trạng ngữ chỉ 
thời gian đứng ở đầu câu sẽ ngăn cách với mệnh đề chính bằng dấu phẩy (comma).
2. Sự phối hợp giữa động từ trong mệnh đề chính và mệnh đề trạng ngữ chỉ thời gian.
2.1. Khi mệnh đề trạng ngữ chỉ thời gian ở thì hiện tại đơn.
 S+ V- Tương lai đơn + until / when / as soon as + S + V-Hiện tại đơn
Ví dụ: She won't come until it is 9 o'clock. (Cô ấy sẽ không đến cho tới 9 giờ.)
2.2. Khi mệnh đề trạng ngữ chỉ thời gian ở thì quá khứ đơn.
- Quá khứ đơn + when/ until/ before/ after/ as soon as + Quá khứ đơn
Ví dụ: She cried as soon as she heard the news. (Cô ấy khóc ngay khi cô ấy nghe thấy tin đó.)
- Quá khứ tiếp diễn + when + Quá khứ đơn
Ví dụ: We were having dinner when she came. (Khi cô ấy tới, chúng tôi đang ăn tối.)
2. 3. Khi mệnh đề trạng ngữ chỉ thời gian ở thì hiện tại hoàn thành.
- Tương lai đơn + after + Hiện tại hoàn thành
Ví dụ: Linh will work for her father's company after she has graduated from university. 
- Hiện tại hoàn thành + since + Quá khứ đơn
Ví dụ: I have played football since I was 7 years old. (Tôi đã chơi bóng đá kể từ khi tôi 7 tuổi.)
- Quá khứ hoàn thành + by the time/ before + Quá khứ đơn
Ví dụ: She had explained everything clearly before we started our work. (Cô ấy đã giải thích mọi thứ 
rõ ràng trước khi chúng tôi bắt đầu công việc.)
2.4. Khi mệnh đề trạng ngữ chỉ thời gian ở thì quá khứ tiếp diễn.
- Quá khứ tiếp diễn + while + Quá khứ tiếp diễn
Ví dụ: He was chatting with his friends while his teacher was teaching the lesson. (Cậu ấy nói chuyện 
với bạn trong khi cô giáo đang giảng bài.)
- Quá khứ đơn + while + Quá khứ tiếp diễn
Ví dụ: The doorbell rang while I was having a shower. (Chuông cửa reo khi tôi đang tắm.)
2.5. Khi mệnh đề trạng ngữ chỉ thời gian ở thì quá khứ hoàn thành.
- Quá khứ đơn + after + Quá khứ hoàn thành
Ví dụ: The thiet left after he had stolen her diamond ring. (Tên trộm rời đi sau khi hắn đã lấy trộm 
chiếc nhẫn kim cương của cô ấy.) 
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 2. Time clauses in English Grammar
 Adverbial clauses of time consist of two clauses: the main clause and the time clause. The time 
clauses begin with: when, whenever, while, as, since, after, before, until, as soon as, once. The time 
clause may come before or after the main clause with no change in meaning. If they refer to the future, 
the Simple Present is used in the time clause, and shall/will + infinitive/perfect infinitive or modal + 
infinitive, or imperative is used in the main clause.
 When a complex clause contains a temporal clause, the time clause has future reference. The future 
is normally indicated by will/shall ('shall' with ' I/we ') but not in the subordinate clause.
 Peter will return soon. Then he will telephone you.
 Peter will telephone you when / as soon as he returns.
That has a future reference. Future is marked by the main clause.
- We may use Present Simple or Present Perfect when we expect future.
 I will return your book on Monday. I will have read it by then.
- We can combine these two sentences into a complex sentence in the following way:
 I will return your book on Monday when / as soon as I have read it.
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BÀI TẬP TIẾNG ANH 8 ( Global Success ) Unit 7: Environmental protection