在英语学习中，语法的学习是非常重要的。英语的句型复杂多变，如果语法知识掌握不够全面很容易出错。下面是出国留学网(www.liuxue86.com)英语四六级频道为大家搜集整理的四级语法大全—非谓语动词，希望对大家有所帮助!
不定式
形式
主动形式 被动形式
一般式 to do to be done
完成式 to have done to have been done
进行式 to be doing
完成进行式 to have been doing
完成式：不定式的一般形式所表示的动作，通常与主要谓语表示的动作(状态)同时(或几乎同时)发生，或是在它之后发生。假如不定式所表示的动作，在谓语所表示的动作(状态)之前发生，就要用不定式的完成式。
I am glad to have seen your mother (= I am glad I have seen your mother).
(比较: I am glad to see you.)
He is said to have written a new book about workers.
He pretended not to have seen me.
进行式: 如果主要谓语表示的动作(状态)发生时，不定式表示的动作正在进行，这时要用不定式的进行式。
You are not supposed to be working. You haven't quite recovered yet.
We didn't expect you to be waiting for us here.
He pretended to be listening attentively.
完成进行式: 在谓语所表示的时间之前一直进行的动作, 就要用不定式的完成进行式.
The struggle was known to have been going for twenty years.
We are happy to have been working with you.
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