to do
完成式
to have been done
to be doing
完成进行式
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之前发生, 就要用不定式的完成式.
I am glad to have seen your mother .
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 havent quite recovered yet.
We didnt 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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