must 的反意疑问句的用法

这个要分两种情况:

1、must表示“必须，一定”，反意问句用must，如:

You

must

do

it

today,

mustn't

you?

You

mustn't

do

that

again,

must

you?

2.

must表示“一定，肯定”推测的时候，和二楼说的一样。要根据情况来定。

如:You

must

be

hungry

now

,

aren't

you?对现在的情况进行推测，用一般现在时。

You

must

have

finished

your

homework,

didn't

you?对过去的情况进行推测，用一般过去时。

You

must

have

studied

English

for

three

years,

haven't

you?表示推测的情况有一段的时间状语，反意部分要用现在完成时。