Professor Johnson has lost his passport again. Its the second time he has lost it.
6) 和ever, never, yet, just, already 等副词连用,如:
Have you ever eaten French cheese?
We have never had a private car.
Has it stopped raining yet? (yet 表示期待雨停止)
Would you like something to eat?
No, thanks. Ive just had lunch.
Dont forget to mail the letter, will you?
Ive already mailed it. (already 表示比预料的要快)
7)与since 或for+一段时间 连用,since 表示与某一时刻或从句连用,表示从那一刻到说话时为止,它总是与完成时连用,如:
She has been here since 6 oclock.
Since I was a child I have lived in England.
I have read the novel for 3 hours.
四、过去完成时
had done
1.概念:以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即过去的过去。
例句:
As soon as we got to the station, the train had left.
By the end of last month. We had reviewed four books.
注意:过去完成时是一个相对的时态。必须有时间状语:before, by the end of last year(term, month),etc. 或则是有一个过去式可做参照,而且动作发生在这个过去式之前。
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