Helppp giúp tui với :(

31. If they water these trees, they won't die 

If loại 1: If + HTĐ, TLĐ

32. It's the first time I have seen this style of jeans 

S + has/have + not/never + V3/ed ... + before

--> It/ This is the first time + S + Has/have + V3/ed 

33. The books must be returned by this friday 

S + must be + V3/ed 

34. Mark has played the piano for ten years

S + began/started + to V/ Ving 

--> S + has/have + V3/ed + for/since + time 

35.. Giống 32

36. I wish I had my teacher's address 

S + wish + S + V2/ed (ước ở hiện tại)

37. The weather was bad, so we didn't go on a picnic 

because (bởi vì) >< so (vì vậy) S + V + so + S + V

38. That house was built three years ago 

S + was/were + V3/ed : thì quá khứ đơn - bị động

39. Hoa asked me if I liked pop music (câu này sai đề và asked)

S + asked + O + if/whether + S + V(lùi thì)

40. Why don't we plant some trees around our house to get more fresh air?

What about + Ving ? = Why don't we/you + V1? đưa ra ý kiến 

41. If Trang hadn't stayed at home, she could have understood the lesson

If loại 3: If + quá khứ hoàn thành, S + could/would + have + V3-ed

42. Susan told me that she was very busy, she would ring me the day after.

S + told + O + that + S + V (lùi thì)

HTĐ --> QKĐ

TLĐ --> would + V1 

#STMIN