在那些选择题中,什么时候用need,must,could,may

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/14 00:03:40

在那些选择题中,什么时候用need,must,could,may
比如说这两题
1.Be polite,You___talk ton the old like that.
A.couldn't B.needn't C.mustn't D.wouldn't
2.--Listen!Is Rose singing in the next room?--No,it___be.She has gone to Shanghai.
A.may not B.can't C.mustn't D.needn't
说明一下理由
C B
再想想

a b
1题needn't 是没必要语境不对
mustn't是禁止更不对
这里是表能力 couldn't 就是不能
2题用can't 是表推测肯定不的意思
建议你问问老师情态动词

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