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when的用法别解释介词,连词之类的,我分不清.概括一下when前后分别在哪种情况下用什么时态就可以了,别复制!急求!明

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/18 12:50:47
when的用法
别解释介词,连词之类的,我分不清.
概括一下when前后分别在哪种情况下用什么时态就可以了,别复制!
急求!明天要考!
1 When I have money in the future,i'll buy a new bike for you.( when 引导了时间状语从句,从句用一般现在时,主句用将来时)
2,When i came in ,I found no one left ( when 引导了时间状语从句,表示过去的事实,主从句都用过去时)
3.I was reading a book in the room when a dog ran in.(when=and at that time)
=While i was reading a book in the room ,a dog ran in
4 Hardly had he arrived when he began to work.( hardly.had +主语+过去分词.when +主语+谓语.)