1 as= because : vì
As she behaves badly, everyone hates her.
2. Although Mr.Minh was very tired, he tried to finish the work.
3. If he had enough money, he could buy a bike => không có thật ở hiện tại : câu đk loại II
4 we used the map which my sister drew for us. => which thay cho the map ; chúng tôi đã sử dụng bản đồ cái mà chị tôi đã vẽ cho chúng tôi.
5 Let's use energy-saving bulbs => cấu trúc : Let's V .

41. She behaves badly, so everyone hates her.

--> As she behaves badly, everyone hates her. (As: bởi vì)

42. Mr. Minh was very tired, but he tried to finish the work.

--> Although Mr. Minh was very tired, he tried to finish the work.

43. He can't buy a bike because he doesn't have enough money. 

--> If he had enough money, ha could buy a bike.  ( If điều kiện loại 2).

44. We used the map. My sister drew the map for us

--> We used the map whick my sister drew for us.

45. I think we should use energy - saving bulds.

--> Let's use energy - saving bulds.   ( Let's + $V_{inf}$  + ... )