when your homework is finished,you may go out to play.为什么用 i

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when your homework is finished,you may go out to play.为什么用 is finished?涉及到哪些语法?
不是要翻译，是要语法解释为什么用is finished

When your homework is finished,you may go out to play.为什么用 is finished?涉及到哪些语法?
答：主从复合句.When引导一个时间状语从句.在这个从句中,主语是your homework,它与finish(完成）之间是被动的关系,所能用了助动词be的形式之一is加上及物动词finish的过去分词.涉及到了句子结构,被动语态.在时间和条件状语从句中用现在时表示将来,所以从句中用is finished,而不用will be finished.涉及到了条件和时间状语从句的时态.因为主语是不可数名词you homework,作单数可数名词看待,涉及了主谓一致.
译：作业完成你就可以出去玩了.

when your homework is finished,you may go out to play.为什么用 i You can go out to play after the homework(is finished)为什么括号内 You can go out when you have finished your homework. if your homework （） finished,you can go out to play when all the homework____you may go out to play为什么要用is finis A Can I go to zoo?B.when your.homework was finished/is finis you may go out _________ your homework is done. Mum,may i go out to play ? -No,you ( ) .you must finish your May I go out to play No you ______ You may go out when your homework________ You may go and play tennis only when your homework __- (fini If you _______ your homework,you can go out to play football