以什么提问时，答句否定形式用mustn't？ must开头的一般疑问句，回答否定形式为什么不用mustn'...
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1\u3001\u5728\u56de\u7b54must\u5f00\u5934\u7684\u4e00\u822c\u7591\u95ee\u53e5\u65f6\uff0c\u80af\u5b9a\u56de\u7b54\u7528must\uff0c\u5426\u5b9a\u56de\u7b54\u7528needn't\u6216don't
have
to.
\u5982\uff1a
1)\u2014Must
I
finish
my
homework
before
eight
o'clock?
\u2014Yes,
you
must.
2)\u2014Must
I
attend
the
meeting?
\u2014No,
you
needn't(No,
you
don't
have
to).
You
can
ask
Tom
to
go
instead.
2\u3001\u5728\u56de\u7b54may\u5f00\u5934\u7684\u4e00\u822c\u7591\u95ee\u53e5\u65f6\uff0c\u80af\u5b9a\u56de\u7b54\u7528may\uff0c\u5426\u5b9a\u56de\u7b54\u7528mustn't.
\u5982\uff1a
1)\u2014May
I
watch
TV
after
supper?
\u2014Yes,
you
may.
/
No,
you
mustn't.
2)\u2014May
I
stop
here?
\u2014No,
you
mustn't.
3\u3001\u5728\u56de\u7b54need\u5f00\u5934\u7684\u4e00\u822c\u7591\u95ee\u53e5\u65f6\uff0c\u80af\u5b9a\u56de\u7b54\u7528must\uff0c\u5426\u5b9a\u56de\u7b54\u7528needn't.
\u5982\uff1a
1)\u2014Need
we
stay
behind
after
school?
\u2014Yes,
you
must.
2)
\u2014Need
he
go
now?
\u2014No,
he
needn't\u3002
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以can 开头的问句，否定回答是can't 或者mustn't ，例如：Can I swim in the river？我可以在这条河里游泳吗？
No,you can't .不，你不可以。
No,you mustn't .It's very dangerous .不，你千万不能，很危险。
以must 开头的问句否定回答是needn't 或者don't have to ，表示“不需要”，例如：
Must I finish my homework now？我必须现在完成家庭作业吗？
No,you needn't .=No，you don't have to . 不，你没有必要。
祝你开心。
mustn't表示语气非常强烈的禁令。绝不可以的意思
1、在回答must开头的一般疑问句时，肯定回答用must，否定回答用needn't或don't have to. 如：
1)—Must I finish my homework before eight o'clock?
—Yes, you must.
2)—Must I attend the meeting?
—No, you needn't(No, you don't have to). You can ask Tom to go instead.
2、在回答may开头的一般疑问句时，肯定回答用may，否定回答用mustn't. 如：
1)—May I watch TV after supper?
—Yes, you may. / No, you mustn't.
2)—May I stop here?
—No, you mustn't.
3、在回答need开头的一般疑问句时，肯定回答用must，否定回答用needn't. 如：
1)—Need we stay behind after school?
—Yes, you must.
2) —Need he go now?
—No, he needn't。
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