b.与被修饰词有主谓关系。

如： Mr Liang is always the first to come and the last to leave.

c.与被修饰之间只有修饰关系。

如： I have no time to play cards.

6.作状语，表示目的、原因、方法、方向、结果等。

如： I'll go to meet my friend at the railway station.

7.不定式复合结构"for sb. to do sth" 作主语时，常用"It is +adj+ for

of sb. to do sth"的句式。形容词good, bad, polite, unkind, kind, ice, clever,

right, wrong, careful等用"It is +adj +of sb. to do sth."

其他形容词用 for。

如：

It's dangerous for you to ride so fast.

It's very kind of you to help me.

8.动词不定式与疑问句who, what, which, when, how, where, whether等连用。

如： I don't know when to start.

He didn't tell me where to go.

但上面结构相当于一个从句，故上述句子也可表达为：

I don't know when we'll start.

He didn't tell me where he would go.

注意：

a.有些动词或动词短语不能带不定式，只能接动词的-ing形式。

如： enjoy, finish, keep, mind, miss(错过),be busy, go on, keep on, be worth, practise等。

如： The peasants are busy picking apples.

Would you mind my opening the door?

b.有些动词后可接不定式，也可接动词的-ing形式，但意思不同。

如： Lu Jian forgot to post the letter.(该寄但还没做)

Lu Jian forgot posting the letter.(已经寄过信了)

They stopped to sing a song.(停止在做的工作而去做另一件工作)

They stopped singing.(停止正在做的工作)

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