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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 (责任编辑：admin) |