to do 中文 详讲

（一）动词不定式：（to）+do，具有名词、形容词、副词的特征。

1．不定式的形式：（以动词write为例）

否定式：not + (to) do

（1）一般式：不定式的一般式所表示的动作与谓语动词动作同时发生或发生在谓语动词动作之后，
例如：

I'm glad to meet you.

He seems to know a lot.

We plan to pay a visit.

He wants to be an artist.

The patient asked to be operated on at once.

The teacher ordered the work to be done.

（2）进行式：不定式的进行式所表示的动作与谓语动词动作同时发生，例如：

The boy pretended to be working hard.

He seems to be reading in his room.

（3）完成式：不定式的完成式表示的动作发生在谓语动词动作之前，例如：

I regretted to have told a lie.

I happened to have seen the film.

He is pleased to have met his friend.

2．不定式的句法功能：

（1）作主语：

To finish the work in ten minutes is very hard.

To lose your heart means failure.

动词不定式短语作主语时，常用it作形式主语，例如上面两句可用如下形式：

It is very hard to finish the wo