下面的反义疑问句中，第一个划线部分为什么不用must，而用needn't？ must的反义疑问句用needn't还是用mustn't?回...
must\u7684\u53cd\u4e49\u7591\u95ee\u53e5\u7528needn't\u8fd8\u662f\u7528mustn't?\u56de\u7b54\u5462?1\u3001mustn't\u2192must
mustn't\u5728\u9648\u8ff0\u53e5\u4e2d\u7684\u610f\u601d\u4e00\u822c\u662f\u4e0d\u5141\u8bb8\uff0c\u7981\u6b62\uff0c\u6240\u4ee5\u4ed6\u7684\u53cd\u4e49\u7591\u95ee\u53e5\u7528must\u6216may
\u4f8b\uff1aYou
mustn't
smoke
here,
must
you?\u6216may
you?
2\u3001must\u2192needn't
\u5f53must\u5728\u9648\u8ff0\u53e5\u4e2d\u4f5c\u201c\u5fc5\u987b\u201d\u89e3\u65f6\uff0c\u5b83\u7684\u53cd\u4e49\u7591\u95ee\u53e5\u5c31\u53d8\u6210needn't
\u4f8b\uff1aYou
must
go
now
,needn't
you?
must\u7684\u53cd\u4e49\u7591\u95ee\u53e5\u662f\u7528needn't\u56de\u7b54
反义疑问句，前肯后否，前否后肯，因为前句为must，must的否定形式是needn't而不是mustn't，mustn't意为禁止，needn't意为不必，如:Must I go to school（我一定要去上学吗？）
Yes，you must（是的，你必须去）
No，you needn't（不，你不必去）
若写作No，you mustn't即为“不，你禁止去”
1、mustn't→must
mustn't在陈述句中的意思是不允许,禁止时,它的反义疑问句用must或may
例：You mustn't smoke here, must you?或may you?
2、must→needn't
当must在陈述句中作“必须”解时,它的反义疑问句就变成needn't
例：You must go now ,needn't you?
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