He must have finished his homework,hasn't he 或 didn't he?
用法請(qǐng)參考下面資料:
陳述句含有情態(tài)動(dòng)詞must有兩種情況：
1、must表示“必須”,反意疑問句部分為mustn’t…?/ needn’t…?
He must study hard at English,mustn’t he?/ needn’t he?
You must go home now,needn’t you?/ mustn’t you?
We mustn’t be late,must we
2、must表示推測(cè)：“一定,肯定” 反意疑問句部分與must后面的動(dòng)詞呼應(yīng)
You must be joking,aren’t you?
He must be ill,isn’t he
3、注意：用must對(duì)過去的動(dòng)作推測(cè)時(shí),反意疑問句部分的助動(dòng)詞用did或have,而對(duì)過去的狀態(tài)推測(cè),反意疑問句部分的be動(dòng)詞用was:
She must have finished her work,hasn’t she / didn’t she
Jack must have arrived here yesterday,didn’t he
He must have been a policeman,wasn’t he