1、英语动词不定式除了构成谓语外(如与情态动词构成复合谓语),不定式可在句中用作主语:
- To go or not to go is a question．
- 去还是不去是一个问题.
- It is not easy to learn English well．
- 学好英语是不容易的.
2、英语动词不定式除了构成谓语外(如与情态动词构成复合谓语),不定式可在句中用作宾语:
- He decided to give up the job．
- 他决定放弃这项工作.
- Tell me how to do it．
- 告诉我该怎样做.
3、英语动词不定式除了构成谓语外(如与情态动词构成复合谓语),不定式可在句中用作表语:
- My job is to look after the baby．
- 我的工作是照顾宝宝.
4、英语动词不定式除了构成谓语外(如与情态动词构成复合谓语),不定式可在句中用作定语:
- I have a lot of things to do．
- 我有很多事情要做.
5、英语动词不定式除了构成谓语外(如与情态动词构成复合谓语),不定式可在句中用作状语:
- He often comes to see us．
- 他常来看我们.
6、不定式还可构成复合宾语(即作宾语的补语):
- She told me not to go out．
- 她让我别出去.
7、不定式有时不带to:
- I saw a man enter the room．
- 我看见一个人进屋来了.
8、有时还有被动形式:
- She like to be praised．
- 她喜欢受人赞扬.
- I was glad to have been invited．
- 受到邀请我很高兴.
9、有时还有完成形式:
- I'm sorry to have given you so much trouble．
- 对不起给你添了这么多麻烦.
10、有时还有进行形式:
- She seemed to be talking with somebody．
- 她似乎在和人谈话.
