高二英语语法：不定式_高中英语语法

　　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.

　　Im glad to be working with you.

　　如果不定式所表示的动作或状态发生在谓语动词所表示动作或状态之前，就用完成式 (to have done) ；若是在此基础上的被动含义，就用完成被动式( 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.

　　如果不定式的动作是在谓语所表示的时间之前一直在进行的动作，就要用完成进行式.

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

　　Were happy to have been working with the experts all the month.

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