神马作文网They must have done their homework yesterday,____?
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They must have done their homework yesterday,____?
这个句子的反意疑问句为什么是didn't they呢?
这个句子的反意疑问句为什么是didn't they呢?
must have done 表示的是对过去动作进行推测,其反义疑问句的构成有两种：didn't .../wasn't(weren't) .../haven't(hasn't)...这两种形式的选择取决于句子中的时间状语.比较一种简单的方法是：不把它看成是推测,就把它看成是一种事实.
比如：He must have been to Beijing,hasn't he?
You must have been late for school yesterday,wasn't you?
换句话说,用过去时还是用现在完成时来进行反问的区别,等同于过去时和现在完成时的区别.
又如：It must have rained last night,didn't it?
比如：He must have been to Beijing,hasn't he?
You must have been late for school yesterday,wasn't you?
换句话说,用过去时还是用现在完成时来进行反问的区别,等同于过去时和现在完成时的区别.
又如：It must have rained last night,didn't it?
They must have done their homework yesterday,____?
They must have done their homework yesterday,___?
They must have finished their homework,_______.
WHAT MUST THEY DO?TH EY MUST DO THEIR HOMEWORK
He must have done nothing but ____
They have finished their ____
( )They have finished their homework,and_______.
They have been doing their homework
They have done ____ work these days.
They did not their homework yesterday.有什么语法错误?
they ( )(not do)their homework yesterday适当形式填空
They must do their homework after school改为同义句