非謂語(yǔ)動(dòng)詞

　　不定式

　　形式

　　主動(dòng)形式 被動(dòng)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(dòng)作, 通常與主要謂語(yǔ)表示的動(dòng)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(dòng)作, 在謂語(yǔ)所表示的動(dòng)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(yǔ)表示的動(dòng)作(狀態(tài))發(fā)生時(shí), 不定式表示的動(dòng)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(yǔ)所表示的時(shí)間之前一直進(jìn)行的動(dòng)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.