动词的时态总结(16)

本人自己的学习经验哦

since连用。或与so far, now, in the past few years, today, this week, up to now等表示包括现在时间在内的状语连用。

He has studied English for 5 years.

I have been here since 1993.

Now I have finished the work.

Up to now, everything has been successful.

表示短暂动作的词如(come, go, die, marry, buy等)的完成时不能与for, since等表示一段时间的状语连用。

3）主句用现在完成时，since后的5种用法： 1He has taught English at this school since 1993.

2I haven’t seen him since three years ago.

3Great changes have taken place here since you left.

4I haven’t heard from Susan since she lived in Shanghai.

5She has seldom been out since she has been ill.

4)现在完成时还可以用在时间和条件状语从句中，表示将来某时完成的动作。

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