may not 语气较弱,”可以不”,You may not finish your homework;
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.;
couldn't 语气较委婉,”不能”,常做could疑问句的回答:Could I sit here?I'm afraide you couldn't;
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.
mustn't 语气强,”禁止”:You mustn't step on the grass.
may not/can't/couldn't/needn't/mustn't举例区别意思和用法
may not/can't/couldn't/needn't/mustn't举例区别意思和用法
其他人气:842 ℃时间:2019-12-19 01:27:05
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