英语have been doing反意疑问句
4个回答

做反义疑问句的时候 首先要搞清楚助动词是哪一个

You must have been playing tennis at the time, _? 这句话中have做助动词 引导现在完成进行时 故应该是

You must have been playing tennis at the time , haven't you ?

She must have a kind mother,_?这句话中must表示推测,而不是表“必须”,反意疑问句应该提取后面的助动词 have做的是实意动词 表示“有”的意思 其助动词应该是do

因为是第三人称单数 所以应该是She must have a kind mother,doesn't she?