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　　--The train has left.

　　--When did the train leave?

　　④since引导的时间状语从句后面用一般过去时，只有前面的主句才用现在完成时。

　　We have known each other since we came to the school two years ago.

　　⑤有些时间状语，如this morning, this month, tonight等，既可以与一般过去时连用，又可以与现在完成时连用，但内涵不同。与一般过去时连用时，表示与“现在”无关，时间已成为过去。而与现在完成时连用，则表示包括“现在”在内。

　　I saw him this morning. (时间已不在上午了。)

　　I have seen him this morning. (说话时间还是上午。)

　　He lived in New York for eight years. (他现在已经不在纽约住了。)

　　He has lived in New York for eight years. (他现在还在纽约居住。)

　　同步练习

　　动词填空：

　　1. I ______(see)Tom last Friday.

　　2. _____you _____(go)to the Great Wall last summer?

　　3.--Where _____you _____(put) my pen?

　　--I ______(put) it in my pencil-box, but it’s nowhere to be found.

　　4.When ______you______(start) to live in China?

　　5.--The train______ (leave) already.

　　--When ______ the train ______(leave)?

　　6.It is five years since I ______(meet) you last.

　　7.Where _____ you_____(be) for the last two weeks?

　　8.I _____ (lose)my pen in the bedroom. I have to write with a pencil.

　　单项选择：

　　(   ) 1. --Where ____ the recorder? I can’t see it anywhere.

　　-- I _____ it right here. But now it’s gone!

　　A.did you put; have put

　　B. have you put;put

　　C. had you put; was putting