主动态: We saw them go out.
我们看见他们出去了。
被动态: They were seen to go out.
有人看见他们出去了。
主动态: He made us work.
他强迫我们干活。
被动态: We were made to work.
我们被迫干活。
然而,惟独let的被动态后面的不定式不带to:
主动态: They let us go.
他们让我们走了。
被动态: We were let go.
我们被允许走开。
D 不定式的进行式可用于如下动词的被动式之后:believe, know,report,say,suppose,think,understand等。
He is believed/known/said/supposed/thought to be living abroad.相当于:
People believe/know/say/suppose/think that he is living abroad.
据信/据知/据说/据猜测/据认为他住在国外。
You are supposed to be working.相当于:
You should be working.
你本应在工作。
在这里也可用不定式的完成进行式:
He is believed to have been waiting for a message.相当于:
People believed that he was waiting for a message.
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