to do的用法总结

不定式可做除谓语之外的所有成分：作主语、作宾语、作定语、作状语、作补语。英语当中动词不定式，它的结构叫做to do。所谓不定式就是表将来，还不定，所以就叫不定式，叫to do。

to do的用法总结：

1、不定式作主语

To see is to believe. （这种情况不常用）

It is important to learn English well.

It 是形式主语，真正的主语是 to learn English well. 这种用法是常用的而且是考点。

2、不定式作表语: 常说明主语的内容、性质和特征或表动作将要发生。

My job is to keep the children safe.

My task is to type the article.

3、不定式做宾语

动词feel, find, make, think等后面，可以用it作形式宾语代替真正的宾语——动词不定式，句子结构是...feel / find / make / ... it+adj. / n.+to do...。

4、不定式做宾语补足语

带to的动词不定式作宾语补足语的动词主要有：要求允许提议(ask, allow, advise)，期望邀请鼓励(expect, invite, encourage)，教导告诉想要(teach, tell, want)，等待希望愿意(wait for, wish, would like / love)。

动词不定式作补语，在主动语态句里不带to，被动语态句里带to时多数动词是感官动词和使役动词，包括四“看”：look at, observe, see, watch，三“让”：have, let, make，二“听”：hear, listen to，一“感觉”：feel，一“注意”：notice。

5、不定式做后置定语

当修饰的名词前有the only, the next, the best, the first, the last, 以及由序数词或形容 词最高级修饰的名词常常用不定式作定语。He was the first one to think of the idea.

当修饰的词为 something, nothing, anything 等不定代词时。Do you have anything to say?

6、用作状语

目的状语，置于句首或句末，置于句首时常表示强调。如：

1) To catch the early bus, she got up very early.

2)A group of young people got together to discuss this question.

3)She came to this city to visit her daughter.

原因状语，多见于“sb.+be+adj.+to do...”结构句中。如：

I am very lucky to have him.

3.结果状语，多见于“too...to”，“enough to...”结构句中。如：

1) I’m too tired to do it well.

2)The room is big enough for three people to live in.

关于to do的固定搭配：

ask sb. to do sth. 请求某人做某事

be pleased /be glad to do sth。很高兴做某事

can't wait to do sth. 迫不及待地做某事

can't afford to do sth. 不能担负起干某事

decide to do sth. 决定做某事

do/try one's best to do sth。尽全力做某事

do nothing to do sth. 对……无能为力

deserve to do sth. 值得干某事

形容词/副词+enough to do sth. 足以做某事

encourage sb. to do sth. 鼓励某人做某事

find + it + 形容词 +to do sth. 发现做某事

get ready to do sth. 准备做某事

go on to do sth. 继续做某事

hope to do sth. 希望做某事

improve sth. to do sth. 改善/提高某物来干某事

invite sb. to do sth. 邀请某人干某事

It's better to do sth. 干某事比较好

It's time to do sth. 到该做某事的时间了

like to do sth. 喜欢做某事

like sb. to do sth. 喜欢某人做某事

love to do sth. 爱做某事