10) 陈述部分有must 的疑问句,疑问部分根据实际情况而定.
He must be a doctor,isn't he?
You must have studied English for three years,haven't you?/ didn't you?
但是,我想,这里有yesterday,所以用didn't.
完成时一般没有具体时间
10) 陈述部分有must 的疑问句,疑问部分根据实际情况而定.
He must be a doctor,isn't he?
You must have studied English for three years,haven't you?/ didn't you?
但是,我想,这里有yesterday,所以用didn't.
完成时一般没有具体时间