Question

have to,must,do not need,needn't的区别

用法和区别

Answer 1

have
to
意为不得不,表示不是主观意义上的想要做什么
must
意思是必须
，带有强烈的语气
do
not
语气比较平和，意思是没有
need意为需要，比如l
need
a
book.
needn't
意为不必，比如，一般用于否定回答must引导的疑问句，例如：Must
l
clean
the
room?
No,you
needn't/No,you
don't
have
to.