41. He said that he would go to Da Nang the next day.

S+  said+(that) + S+ V (lùi thì)

will ⇒ would 

tomorrow ⇒ the next day / the following day 

42. Were I a bird, I would be very happy.

Were +S , S + would / could + V1: if loại 2 - đảo ngữ

43. It is difficult to learn English.

Ving + be+ ADJ 

= It's + ADJ + to V 

44. I haven't seen Peter since we attended the school meeting.

S +has/have+  not + V3/ed + for/since+ time 

45. Scarcely had I gone home when I phoned him.

Scarcely + had +S+ V3/ed, S + V2/ed: ngay khi .. thì ... 

46. The boy was too tired to keep on walking.

S + be+ too + ADJ + (for O) + to V: quá ... đến nỗi 

47. He is thought to have worked very hard last year.

S + be+ V3/ed + to have + V3/ed : bị động - không ngôi

48. The book which I bought yesterday is very interesting.

N (vật) + which + V /S + V 

49. It took me one hour to go to work by bicycle.

It took +O + time + to V: mất bao nhiêu thời gian để làm gig 

50. Unless she rests herself, she really will be ill.

If 1: if + HTD, TLD

Unless: trừ khi = If ... not 

`color{orange}{~MiaMB~}`