关于英语后置否定形式.
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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?
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?
hasn't he 是对 he have 发问
did they 是针对 they couldn't have 发问
did they 是针对 they couldn't have 发问