Question

以什么提问时，答句否定形式用mustn't？

Answer 1

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。