`1.` It is high time I went to school.

Giải thích: It's high time S V-ed: Đã đến lúc phải làm gì.

`2.` Mary last saw her parents when she left for the USA.

Giải thích: S have/has Vpp since [thời gian] = S last V-ed when [thời gian].

`3.` I am having my car serviced tomorrow.

Giải thích: have sth done: có cái gì đó được làm gì.

`4.` This the first time I have ever tasted pleasant.

Giải thích: This is the first time S have/has Vpp: Lần đầu tiên ai đó làm gì.

`5.` Mary asked me if I could tell her why I was so sad.

Giải thích: S1 asked S2 if S V-lùi thì.

`6.` It was such a difficult exercise that we couldn't do it.

Giải thích: It be such a/an adj N that S V.

`7.` He wishes he was able to speak English well.

Giải thích: Ước một điều không có thật ở hiện tại: S wish(es) that S V-ed.

`8.` They still want to go to school although it's raining hard.

Giải thích: although + mệnh đề: mặc dù.

@ `Ly`

1) I had better go to school now.

=> It is hight time I went to school now

2) Mary hasn't seen her parents since she left for the USA.

=> Mary last saw her parents was before she left for the USA.

3) They are servicing my car tomorrow.

=> I am having my car serviced tomorrow

4) I've never tasted pleasant before.

=> This is the first time I have tasted pleasant

5) Mary ask me " Can you tell me why you are so sad ?".

=> Mary asked me if I told she why I was so sad

6) The exercise was so difficult that we couldn't do it.

=> It was so difficult for us to do the exercise.

7) He is sorry he is not able to speak English well.

=> He wishes he could speak English well

8) It is raining hard, but they still want to go to school.

=> They still want to go to school although it is raining hard