名师讲解非谓语动词语态词态
完成式: 不定式的一般形式所表示的动作, 通常与主要谓语表示的动作(状态)同时(或几乎同时)发生, 或是在它之后发生。 假如不定式所表示的动作, 在谓语所表示的动作(状态)之前发生, 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)。
(比较: I am glad to see you。)
He is said to have written a new book about workers。
He pretended not to have seen me。
进行式: 如果主要谓语表示的动作(状态)发生时, 不定式表示的动作正在进行, 这时要用不定式的进行式。
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。
完成进行式: 在谓语所表示的时间之前一直进行的动作, 就要用不定式的完成进行式。
The struggle was known to have been going for twenty years。
We are happy to have been working with you。
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