1 you must be tired,aren't you?2 you must go home right now,needn't you?3 you mustn't walk on grass,must't you?为什么都含must,反意疑问句都不一样~

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1youmustbetired,aren''tyou?2youmustgohomerightnow,needn''tyou?3youmustn''twalkongrass,must''tyou?为什么都含mu

1 you must be tired,aren't you?2 you must go home right now,needn't you?3 you mustn't walk on grass,must't you?为什么都含must,反意疑问句都不一样~
1 you must be tired,aren't you?
2 you must go home right now,needn't you?
3 you mustn't walk on grass,must't you?
为什么都含must,反意疑问句都不一样~

1 you must be tired,aren't you?2 you must go home right now,needn't you?3 you mustn't walk on grass,must't you?为什么都含must,反意疑问句都不一样~
“must”在反意疑问句中的用法
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表示推测时:
They must be playing basketball,mustn't they?
他们肯定在打篮球,是不是?
逗号前的陈述句中的谓语部分含有“推测”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?

1你一定....表示猜测
2你必须...肯定句
2你不许...否定句

1、must be 词组:肯定是
2、must - needn't 必须 - 不必
3、mustn't 不准,不允许,禁止