英語四級語法基礎(chǔ)知識：

Ⅱ 非謂語動詞

不定式

形式：主動形式、被動形式

一般式 to do to be done

完成式 to have done to have been done

進(jìn)行式 to be doing

完成進(jìn)行式 to have been doing

完成式：不定式的一般形式所表示的動作，通常與主要謂語表示的動作(狀態(tài))同時(shí)(或幾乎同時(shí))發(fā)生，或是在它之后發(fā)生。假如不定式所表示的動作，在謂語所表示的動作(狀態(tài))之前發(fā)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).

(比較: I am glad to see you.)

He is said to have written a new book about workers.

He pretended not to have seen me.

進(jìn)行式：如果主要謂語表示的動作(狀態(tài))發(fā)生時(shí)，不定式表示的動作正在進(jìn)行，這時(shí)要用不定式的進(jìn)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.

完成進(jìn)行式：在謂語所表示的時(shí)間之前一直進(jìn)行的動作，就要用不定式的完成進(jìn)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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