may,must,can,need的否定和肯定回答.

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may,must,can,need的否定和肯定回答.
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may,must,can,need的否定和肯定回答.
may,must,can,need的否定和肯定回答.

may,must,can,need的否定和肯定回答.
Yes,you may.No,you can't/ mustn't.Can I do sth?Yes,youNo,you don't have to .Need I do sth?Yes ,you must.No,

may+not; must+not; can+not; need+not

用can 回答,不可以用must回答may提问的否定回答可以用May not,need否定回答needn't