when或while引导的时间状语从句,主句为祈使句或含有情态动词,从句什么时态?

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when或while引导的时间状语从句,主句为祈使句或含有情态动词,从句什么时态?
when或while引导的时间状语从句,主句为祈使句或含有情态动词,从句什么时态?

when或while引导的时间状语从句,主句为祈使句或含有情态动词,从句什么时态?
1 如果你会合并下列句子,你的这个问题就OK了:
He came She was wating
1 When he came,she was waiting
2 While she was waiting,he came
3 She was waiting when he came
4 He came while she was waiting
2 主句为祈使句或含有情态动词时:
1 Give this book to Tom when he comes tomorrow (从句是一般现在时---连接词是when)
2 Tom.you must be quiet while Kate is doing her homework (从句是现在进行时----连接词是while)
3 Return the book to me when you have finished reading it (从句是现在完成时-----连接词是when)

根据时间状语从句的构成原则,“when或while引导的时间状语从句,主句为祈使句或含有情态动词”时, when 多引导一般现在时,用一般现在时来表示将来的意义,如 Help your friends when they are in trouble. (当朋友有困难时,帮一帮他们) ; 而 while 多用过去进行时,例如 You can play computer games whi...

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根据时间状语从句的构成原则,“when或while引导的时间状语从句,主句为祈使句或含有情态动词”时, when 多引导一般现在时,用一般现在时来表示将来的意义,如 Help your friends when they are in trouble. (当朋友有困难时,帮一帮他们) ; 而 while 多用过去进行时,例如 You can play computer games while your sister is watching TV. (当你妹妹看电视时,你可以玩电脑游戏)。

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