mustn't和needn't和can't和shoudn't的区别
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mustn't
语气强，”禁止”;千万不要的意思
例如:You
mustn't
step
on
the
grass.
needn't
表示不必这么做：常做must问句的回答：Must
I
finish
my
homework
today?
No,
you
needn't.
can't
”不能”;
You
can't
be
too
serious;问句回答时：Can
I
go
out
to
play?
No,
you
can't.
或做may问句的回答：May
I
sit
here?
No,
you
can't.;
shoudn't语气较委婉，”不应该”
语气强，”禁止”;千万不要的意思
例如:You
mustn't
step
on
the
grass.
needn't
表示不必这么做：常做must问句的回答：Must
I
finish
my
homework
today?
No,
you
needn't.
can't
”不能”;
You
can't
be
too
serious;问句回答时：Can
I
go
out
to
play?
No,
you
can't.
或做may问句的回答：May
I
sit
here?
No,
you
can't.;
shoudn't语气较委婉，”不应该”
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