must有两种用法1.表示猜测很大程度的猜测 其疑问和否定要用can can't.反义疑问常跟后面实意动词一致
2.表示符合主观意志的必须应该,疑问和否定用need needn't
The light is off.He must go to bed,doesn't he?灯没亮,很可能睡觉了,难道不是吗?
It's getting dark.I must go home.Needn't you?天黑了,必须回家,有必要吗?
The light is off.He must go to bed,().A doesn't he.B needn't
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