英语时态 The mother will finish (doing) the housework before the baby (wakes) up.如题的句子,括号中的词为什么要用这个时态?主要是关于时态的问题.

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英语时态 The mother will finish (doing) the housework before the baby (wakes) up.
如题的句子,括号中的词为什么要用这个时态?主要是关于时态的问题.

句子结构是,主句从The mother一直到housework,后面是before引导的时间状语从句.
你这是一道题吧?按题讲:
第一个空:结束做某事finish doing sth.--固定搭配,搞定√
第二个空(时态问题):
首先,主句“will+动词原型finish”--一般将来时,所以是在说“将来”的某时宝宝醒了,在那之前妈妈要做完家务.即:从句为将来时.
但是为什么不是will wake up呢?因为一般现在时的一条特殊规则:“条件状从、时间状从 无将来时,常用一般时表将来”,即"wakes".
因为这话已经暗含宝宝会醒,will安进从句里就多此一举了,没有这么用的,搞定√
选我选我选我!^ ^

第一个括号里的doing是因为 finish doing sth是个固定搭配,就是说finish后面只能用动名词,所以跟时态无关
第二括号里用一般现在时,是因为这是时间状语从句,从句为“ the baby wakes up"。语法规则是:时间状语从句中,从句用一般现在时表将来。

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