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关于英语后置否定形式.1.HemusthavegonetoBeijing,hasn'the?2.Theycouldn'thavefinishedityesterday,didthey?为什么两个句子后面,一个用HAS,一个用did?

题目详情
关于英语后置否定形式.
1.He must have gone to Beijing ,hasn't he?
2.They couldn't have finished it yesterday,did they?
为什么两个句子后面,一个用HAS,一个用did?
▼优质解答
答案和解析
hasn't he 是对 he have 发问
did they 是针对 they couldn't have 发问