e.g.　 Please tell me how I can get to the nearest post office.

　　　 = Could you tell me how to get to the nearest post office?

　 此类题目要求学生明白疑问词与动词不定时连用的含义，构成不定时结构如：

how to…,when to…, what to…, where to…等。还要注意一些含动词不定式的短语，

如：ask sb.(not) to do sth., tell sb. (not) to do sth.等。

Exercises:

43.A. Our teacher told him that he shouldn’t be late the next time.

　 B. Our teacher told him __________ __________ _________ late the next time.

44A. They are thinking of what they should do next.

B. They are thinking of ___________ ________ ____________ next.

42.A. He became an English teacher 15 years ago.

　 B. He ________ ____________ an English __________ 15 years ago.

C. He __________ __________ English for 15 years.

　 D. It ________ ____________ 15 years ____________ he started teaching English 15 years ago.

41.A. I closed the window two minutes ago.

B. The window __________ ___________ ____________ for two minutes.

40.A. It’s about ten minutes since he left the room.

　 B. He ________ the room ten minutes __________.

　　 C. He ________ __________ ___________ ___________ the room for about ten minutes.

39.A. His uncle bought the new house two and a half years ago.

　 B. His uncle ___________ __________ the new house for ________ ________ and ______ _________.

e.g.　　 I borrowed this book from the school library three weeks ago.

　　　 = I have kept this library book for three weeks.

　 此类题目既要要求对一些动作动词(常是瞬间动词)相关的状态动词(常是非延续动词)很熟悉，还要注意时态的变化，通常是一般现在时变为现在完成时。特别注意瞬间动词不能与表示一段的时间状语联用；有些句子在变化时主语要作一定的调整。

Exercises:

38.A. The young man has been in the army for four years.

　 B. The young man ___________ the army four years _________.

C. __________ two years ___________ the young man ________ the army .

37.A. A large number of people speak English in the world.

　 B. English __________ ____________ ________ many people in the world.

36.A. People grow rice in southern China.

　 B. Rice _______ ___________ in southern China.

35.A. People built this bridge 1500 years ago.

　 B. This bridge _________ ___________ 1500 years ago.

34.A. We must look after old people well.

　 B. Old people ___________ _________ __________ ________ well.