e.g. I found it impossible to work out the problem without a computer.

可接不定时作宾语的动词有：

aim　appear　agree　arrange　ask　 decide　bother　care　choose　come dare　demand　desire　determine　expect　elect　endeavor hope fail　happen　help　hesitate　learn　　mean　manage　offer　ought　plan　prepare　pretend　promise　refuse　seem　tend　wait wish　refuse attempt continue

1. 作宾语补足语

e.g. I heard them sing yesterday.

She asked me to answer the phone in her absence.

注意：hope, demand, suggest后不能接不定式作宾语补足语。

2. 作定语

e.g. The next train to arrive was from New York.

On Sundays, he always has a lot of letters to write.

3. 作状语

e.g. I'm saving up to buy a computer.

He got to the station only to find the train had gone.

不定式表示结果常见于下列句型。

1) so ... as to do Would you be so kind as to lend me your bicycle 把你的自行车借给我好吗？

2) such ... as to do We are not such fools as to believe him. 我们还没蠢到竟会相信他。

3) enough... to do He didn't run fast enough to catch the train.他跑得不够快, 没赶上火车。

4) only to do He lifted a rock only to drop it on his own feet. 他搬起石头砸自己的脚。

5) too ... to do His eyesight is too poor to read such small letters. 她的视力太差了，不能看这么小的字。

注意: too...to...结构中的形容词如果是eager, pleased, happy, ready等，动词不定式不表示结果，也没有否定的意思。 The boy was too eager to get a geography book. 那个男孩非常急切地想要得到一本地理书。 He is too anxious to know the examination results. 他很急切地想知道考试结果。

三. 不定式的几种常见结构

1. 不定式的复合结构

e.g. This box is too heavy for the little boy to carry.

2. 疑问词+不定式结构

e.g. I don't know whether to go to the meeting or not.