Must肯定回答是must,否定回答是needn't
Should肯定回答是should,否定回答是shouldn't
Can肯定回答是can,否定回答是can't
could和can意思差不多,肯定回答could,否定回答couldn't
望采纳哦(´-ω-`)
must:yes,you must. no,you needn't.
should:yes,you should. no,you needn't.
need:Yes,you should/may/can/need. No.you needn't/musn't
may:Yes,you may/can. No,you musn't/can't.
can:yes,you can. no,you can't/you may not.
看看是不是要这个?
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