=>
1. New devices have been invented to help people live a longer life by scientists.
-> câu bị động thì HTHT have/has been V3/ed
2. If I had enough time, I could go on holiday this summer.
-> câu đk loại 2 If S V2/ed, S would/could V
3. In spite of having a broken leg, the man tried to save his wife.
-> In spite of N/Ving = although S V : mặc dù
4. If I knew the answer, I could tell you.
-> câu đk loại 2 If S V2/ed, S would/could V
5. If they review them all hard, they will do the test well.
-> câu đk loại 1 If S Vs/es, S will V
6. The villagers in the raged flood were evacuated to the safe place by the rescue workers last night.
-> bị động QKĐ was/were V3/ed
7. Aids for the homeless people will be provided by the students tomorrow.
-> bị động TLĐ will be V3/ed
8. If the people protect the environment now, it will be nice.
-> câu đk loại 1 If S Vs/es, S will V
9. If they had a map, they wouldn't get lost.
-> câu đk loại 2 If S V2/ed, S would/could V
10. Many houses in this village were destroyed by the storm last week.
-> bị động QKĐ was/were V3/ed
11. Was food given to homeless people last year?
-> bị động QKĐ was/were V3/ed
12. Despite the bad weather, the football match was not canceled.
-> Despite N/Ving = although S V : mặc dù
13. If the people protect the environment now, it will be nicer.
-> câu đk loại 1 If S Vs/es, S will V
14. If they had a map, they wouldn't get lost.
-> câu đk loại 2 If S V2/ed, S would/could V
15. Many houses in this village were destroyed by the storm last week.
-> bị động QKĐ was/were V3/ed
16. Many rivers and lakes are poisoned because factories produce waste and pour it into rivers and lakes.
-> because S V : bởi vì
17. Plastic bags are a major source of waste, so we should not throw plastic bags everywhere.
-> so : vì vậy, vậy nên
18. We won't hold the festival if it costs too much money.
 -> câu đk loại 1 If S Vs/es, S will V
19. While the tortoise was running, the hare was sleeping.
-> while QKTD : trong khi
20. Although the girl worked hard, her stepmother wasn't happy.
-> allthough S V : mặc dù