can may must should have to need 的区别

should，must，need，can都是情态动词，后面都只能跟动词原形，分别解释为应该，必须，需要，可以。

其中need可分为两类：一、need

do，否定形式为needn't

do,肯定回答为yes,i

need.否定回答为no,i

needn't.二、need

to

do，否定形式为don't

need

to,肯定回答为yes,i

do.否定回答为no,i

don't.

用must提问时，肯定回答要用must，否定回答要用need，比如：a:must

i

do

it

now?

b:yes,you

must./no,you

needn't.

have

to解释为不得不，后面跟动词原形。比如：i

have

to

go

now.

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