�。═he Infinitive）

　　定義：動詞不定式是非謂語動詞的一種，它沒有人稱和數的變化，在句子中不能獨立作謂語，但它仍保持動詞的特點，既可以有自己的賓語和狀語。 E.g. He want his students to read the book aloud.

　　A．

　　1不定式的構成 （以動詞do為例）

　　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

　　進行式 to be doing 無

　　完成進行式 to have been doing 無

　　2不定式的意義

　　不定式的一般式(to do )

　　一般式表示的動作或狀態，發生在謂語動詞表示的動作或狀態的同時或之后

　　My wish is to become a doctor

　　He seemed to be tired.

　　She stopped to have a rest.

　　不定式的被動式 (to be done)

　　當不定式的邏輯主語是這個不定式所表示的動作的承受者時,不定式一般要用被動式.

　　The building to be finished next month is for our teachers.

　　I am going to Beijing, I have something to take to my parents, do you have something to be taken to your parents?

　　如果謂語表示的動作(情況)發生時, 不定式表示動作正在進行,這時候不定式就要用進行式.（to be doing）

　　They are said to be building another bridge across the street.

　　They seemed to be talking about something important.

　　When I went to his home, he happened to be traveling around the world.

　　I’m glad to be working with you.

　　如果不定式所表示的動作或狀態發生在謂語動詞所表示動作或狀態之前，就用完成式 (to have done) ；若是在此基礎上的被動含義，就用完成被動式( to have been done).

　　He is said to have written a novel about the Long March.

　　He thought it a pity not to have invited us.

　　The assistant seemed to have been fired.

　　He is said to have been taught French when he was a child.

　　Einstein is said to have built up his theory when he was in his twenties.

　　如果不定式的動作是在謂語所表示的時間之前一直在進行的動作，就要用完成進行式.

　　They are said to have been collecting folk song in Xinjiang.

　　We’re happy to have been working with the experts all the month.