-your father is a soldier,isn't he?- no,but he used to be.这里

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-your father is a soldier,isn't he?- no,but he used to be.这里为什么不能回答no,but he used to.
什么情况下可以用No，but he used to.来回答呢？具体一点哦，最好有例句哦。

如果是to 那前面的句子的谓语是行为动词.
而你现在的句子里"is"是系动词所以要用to be.
例如:You often go shopping on Sunday,don't you?
就可以答 No,but I used to.这里的go就是行为动词

-is he your father or your uncle?A.yes,he is B.no,he isn't C He isn't such a man ____he used to be. He isn't your father,but your mother's.Who is he? where is your father?Is he at home No.he isn't. He isn't such a man ______he used to be .答案就是说as在这里做表语啊.你为什么 He isn't such a man ______he used to be.答案是as.为什么as在这里做表语啊? Is Bob your brother?A.no,it isn't.B.no,he isn't.C.no,she isn He used to be a teacher,( A.isn't he B.doesn't he C.didn't h Isn't your uncle an engineer?A No,he isn't B No,he is C Yes, Fred be afraid of his math teacher.But now he .A.used to,isn He isn't the man ____he used to be your father is a kind man,()?A.isn't he B.aren't you