使用当前完成时和过去完成时常用的句型

(1)since句型：主要句子完成后，

我的aunt has worked in a clinic since 1949。

从1949年开始，我婶婶一直在一家诊所工作。

(2)since when＋完成时

Since when have you planted so many young trees?

从什么时候开始你种植了这么多小树的？

(3)This/it is the first (third...) time done sth.

This is the first time I have been here.

这是我第一次到这儿。

(4)by...(到……为止)到过去某个时候为止用过去完成时，到现在为止用现在完成时，到将来某个时候为止用将来完成时

She will have finished the book by my next birthday.

到我下一个生日为止，她将完成那本书。

比较

By the time the speaker entered the hall，all the listeners were seated.

就在主讲者进入大厅的时候，所有的听众都坐好了。

(5)in the past time( two days/years...) ＋完成时

In the past 10 years，there have been great changes in our family life.

在过去的十年里，我们的家庭生活发生了很大的变化。

(6) hardly...when... (no sooner...than)前面句型用过去完成时

Hardly had I reached the school when the bell rang.

我一到学校，铃就响了。

(7) 未实现的愿望、打算等用过去完成时

I had thought I could pass the final examination but I failed.

我估计我可以通过期末考试，但结果我没通过。

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