he must be helping the old man to water the flowers,Ais he Bisn't he Cmust he Dmustn't he
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he must be helping the old man to water the flowers,
Ais he Bisn't he Cmust he Dmustn't he
选择B.must反义疑问句的详细用法讲解如下:
当陈述部分有情态动词must,问句有4种情况:
(1)mustn't表示“禁止,不可,不必”时,附加问句通常要用must.
You mustn't stop your car here,must you?
你不能把车停在这地方,知道吗?
(2)must表示“有必要”时,附加问句通常要用needn't.
They must finish the work today,needn’t they?
他们今天要完成这项工作,是吗?
(3)当must用来表示对现在的情况进行推测时,问句通常要根据must后面的动词采用相应的形式.
He must be good at English,isn’the?他英语一定学得很好,是吗?
She must be a good English teacher,isn’t she?她一定是位优秀的英语老师,是吗?
(4)当must have done表示对过去的情况进行推测(一般句中有明确的过去时间状语),问句要根据陈述部分谓语的情况用“didn't+主语”或“wasn't/weren't+主语”;如果强调动作的完成(一般没有明确的过去时间状语),问句要用“haven't/hasn't+主语”.
She must have read the novel last week,didn’t she?
她上星期一定读了这本小说,是吗?
You must have told her about it,haven’t you?
你一定把这事告诉她了,是吗?
速记方法 前肯后否,前否后肯,前be后be,前无be后加助,时态一致.
B isn't he