2. It is time(for sb) to do sth, sth to eat / drink， have nothing to do等句型中要用动词不定式。

　　如果所给的动词在句子中不作谓语，就应该考虑用动词的非谓语动词形式。究竟选用哪种非谓语动词形式，可根据情况从以下几方面来考虑：　

1. 在及物动词want， hope, wish， decide， would like等动词后用不定式作宾语。

2. Now basketball ________ (enjoy) by people all over the world.

　　(Key: 1. was told　 2. is enjoyed)

　　注意：不及物动词或相当于不及物动词的短语动词(如：listen,　 sleep， happen， get up， grow up， break out， come in等)没有被动语态形式。如：

　　The plane has disappeared.

　　The war broke out many years ago.

　　但是，当“不及物动词+介(副)词”构成的短语动词其作用相当于及物动词时，则有被动语态形式。如：

　　The children are looked after well in the school.

　　我们在考虑时态的同时，也要考虑语态。当句子的主语是谓语动词动作的承受者时，用被动语态；反之用主动语态。如：

1. Yesterday I ________ (tell) that we would have a picnic on the beach.

3. -I have bought a CD.

　　 -When ________ you ________ (buy) it?

　　(Key：1. is listening 2. is / was playing, is / was writing 3. did， buy)

2. While Amy ________ (play) in the garden, her brother ________ (write) in the room.

1. Be quiet! The girl ________ (1isten) to the radio.

3. 根据上下文确定时态。

　　有时句子没有明显的时间状语，也不能用时态呼应规则来对照，这时就可以根据上下文的内容来判断时间关系，确定时态。如：

3. I ________ (meet) an old friend of mine when I ______ (walk) in the street yesterday afternoon.

　　(Key：1. doesn't rain 2. arrives 3. met, was walking)

2. Could you give me a call as soon as she______ (arrive)?