while引导的时间状语从句，从句是进行时，主句的时态什么时候用过去进行时，什么时候用一般过去时？ since引导的时间状语从句，主句可以用一般过去时么
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1. 通常用在事情同时发生的情况，主句和从句都用过去进行时
eg:Mother was cooking the meal while i was doing my homework.
当妈妈在做饭的时候，我正在做功课
2. 表示同时，而...的意味时，主句和从句的时态是一致的，即可以都是一般现在时，又可以都是一般过去时，如：
I like playing football while Jim likes playing basketball.
我喜欢踢足球，然而Jim喜欢打篮球。
Yesterday my parents went to the cinema while I stayed at home.
昨天爸爸，妈妈去看电影了，而我呆在家里在。
您好，很高兴为您解答！
(1)引导时间状语从句,从句中的谓语动词应用延续性动词或表示状态的词。
eg.
While the discussion was still going on,George came in.
当讨论还在进行时,乔治走了进来。
Strike while the iron is hot.
趁热打铁。
（2）while强调同时性或某时间段内一种情况发生时另一种情况出现,与延续性动词连用;when可与延续或非延续性动词连用。
eg.———I’m going to the post office.
———______you’re there,can you get me some stamps?
A.As B.While
C.Because D.If
解析:从该题的题意可以看出C、D两选项不合题意；而as侧重同时性,不合题意;while可指一时间段发生某情况时,另一情况出现,正合题意。
具体看句子表达的含义还有动作发生的需求吧。
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