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(1) since句型:主句用现在完成时
例:My aunt has worked in a clinic since 1949.
从1949年,我婶婶就一直在一家诊所工作。

(2) so far /yet /already等 +现在完成时
例: So far, she hasn’t enjoyed the summer vacation.
到目前为止,她还没有享受过暑假。

(3) This/it is the first (third…) time sb. have done sth.(现在完成时
例:This is the first time I have been here.
这是我第一次到这儿。
This/it was the first (third…) time sb. had done sth.(过去完成时
例: It was the second time someone had interrupted me that evening.
这是那天晚上第二次有人打扰我。

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(4) by the time /by the end of(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
例:The experiment had been finished by 4 o’clock yesterday afternoon.
这个试验昨天下午4点才完成。

(5) in the past time( two days/years…) +现在完成时
例: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句型用过去完成时,意为一….就…,且倒装
例:Hardly had I reached the school when the bell rang.teacheray.com
我一到学校,铃子就响了。
No sooner had we sat down at the table than the phone rang.
我们刚坐到桌子旁边电话就响了。

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(7) 未实现的愿望打算等用过去完成时,如expect, hope, mean, intend, plan, suppose, wish, want, desire等
例:I had thought I could pass the final examination but I failed.
我原以为我能通过期末考试,但是失败了。

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