[英语]when/while引导的从句,主句和从句时态的使用.
1、由when引导的时间状语从句,主句用过去进行时,从句用一般过去时。如:
He didn’t tell me when we should meet again. 他没有告诉我什么时候我们能再见面。
When he was still a little boy,Jack London wrote some compositions which were praised by his teachers.杰克·伦敦还是小孩时,他写的一些作文就受到老师的赞赏。
2、while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。如:
Mother was cooking the meal while i was doing my homework。我做作业时,妈妈正在做饭。
She got married while she was working as a waitress。她在饭店当服务生期间结婚了。
扩展资料:
1、主句是一般现在时,从句时态不变。
He says (that) he will leave a message on my desk.他说他将在我桌上留言。
They know (that) he is working hard.他们知道他在努力工作。
2、主句是一般过去时,从句为各种相应过去时态。
He answered that he was listening to me.他回答说他在听我说话。
3、主句是一般将来时,一般从句为一般现在时(“主将从现”)。
4、当从句所叙述的事实为一个定理或客观存在时,无论主句是什么时态,从句均用一般现在时。但与人有关的均不是定理。
He told me that he was a boy. 他告诉我他是个男孩。
(虽然性别是客观存在的,但“男”“女”也是人为定义的,故非第4种情况)
Father told me that practice makes perfect. 父亲告诉我,熟能生巧。
(所叙述的事实为一个定理,用一般现在时)
参考资料来源:百度百科-从句
when引导的时间状语从句,一般是两个情况,一个是主将从现,比如I will visit you when I am free.还有一个是从句用一般过去时,主句用过去进行时,比如I was reading a book when he came.
while引导的时间状语从句,你只要保证从句用进行时就可以了,主句无所谓,当然一般主句也用进行时,比如I was reading a book while he was watching TV.
when主句是将来时时,从句为现在时
when从句为瞬间性动词,主句为进行时,从句为延续性动词时,主句不为进行时
从句为进行时,主句也为进行时
eg i will tell you when he arrives.
试分析,当“他来到的”那一瞬间,是一个时间点,这并不难理解
而while是用来引导时间段的从句,此时,主从句多出现进行时态(现在进行和过去进行等)
eg what were you doing while your father was watching tv this morning?
when当...时候
when后面从句的内容只能是一个时间点
while后面从句可以是是时间点也可以是时间段
进行时态绝对只能用while.其实时态则看情况而定,如果是强调那一个时刻发生的那就用when.其它则可以用while.
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