He must have finished his homework,_________________(是吗？）
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He must have finished his homework, hasn't he 或 didn't he?
用法请参考下面资料:
陈述句含有情态动词must有两种情况：
1、must表示“必须”，反意疑问句部分为mustn’t…? / needn’t…?
He must study hard at English, mustn’t he? / needn’t he?
You must go home now, needn’t you? / mustn’t you?
We mustn’t be late, must we ?
2、must表示推测：“一定，肯定” 反意疑问句部分与must后面的动词呼应
You must be joking, aren’t you?
He must be ill, isn’t he ?
3、注意：用must对过去的动作推测时，反意疑问句部分的助动词用did或have, 而对过去的状态推测，反意疑问句部分的be动词用was:
She must have finished her work, hasn’t she ? / didn’t she ?
Jack must have arrived here yesterday, didn’t he ?
He must have been a policeman, wasn’t he ?
祝您学习进步，更上一层楼！！！O(∩_∩)O
用法请参考下面资料:
陈述句含有情态动词must有两种情况：
1、must表示“必须”，反意疑问句部分为mustn’t…? / needn’t…?
He must study hard at English, mustn’t he? / needn’t he?
You must go home now, needn’t you? / mustn’t you?
We mustn’t be late, must we ?
2、must表示推测：“一定，肯定” 反意疑问句部分与must后面的动词呼应
You must be joking, aren’t you?
He must be ill, isn’t he ?
3、注意：用must对过去的动作推测时，反意疑问句部分的助动词用did或have, 而对过去的状态推测，反意疑问句部分的be动词用was:
She must have finished her work, hasn’t she ? / didn’t she ?
Jack must have arrived here yesterday, didn’t he ?
He must have been a policeman, wasn’t he ?
祝您学习进步，更上一层楼！！！O(∩_∩)O
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haven't he?
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