Question

“must”在反意疑问句中的用法有哪些啊？麻烦了。

如题！

Answer 1

“must”在反尺清意疑问句中的用法

1. must作“必须”解释， mustn't作“不允许”解释时
They must clean the floor, mustn't they/needn't they?

他们必须擦地板，是不是？

We must stay at home, mustn't we?

我们必须留在家里，是轮银不是？

We mustn't be late, must/may we?

我们不许迟到，是不是？

2. must表示推测陵桐前时：

They must be playing basketball, mustn't they?

他们肯定在打篮球，是不是？

Answer 2

反意疑问句中
1. must必须 mustn't不允许
2. must表示推测陵基 (表橘汪销示肯定语气)
He must be at home ，Mustn't he？

一般句中还圆游可表示 “ 偏偏”
Why Must You Do This？你为什么要偏偏做这些事？（含不赞同的意思）

Answer 3

1. must作“必须”解释简辩，液桐 mustn't作“不允许”闹咐坦解释时
2. must表示推测

Answer 4

逗号前的陈述句中的谓语部分含有“推测”扒渣空性的must 时，先把must去掉再看后面的动词该用什么时态和形式。
Her mother must be a teacher, isn't she？
must去掉，后面的动春瞎词应该是is 。
She must have read the novel, hasn’/didn't she？ must去掉 后面的动词应该是has read 或 read 。因为用must对梁扒现在完成时和一般过去时的推测都是must have done 形式。句子中有时间状语时比较容易区别。
He must have come now ,hasn't he?
He must have come last week, didn't he?

但是：You must(必须) work hard next time ,musn't you?
You must(必要) go home right now , needn't you?

Answer 5

must have done...mustn't he?
must have done yesterday....didn't he