yes,i used to be a teacher no,i didn't use to be a teacher / no,i usedn't to be a teacher used to do 的否定有两个, sb didn't use to do sth sb usedn't to do sth 两个都可以. 再问: 要最简回答。 再答: 最简么就是 yes 和 no啊, 不过考试通常不是这么简单吧 你要简要么, yes, i did / no, i didn't 再问: Nono.不对吧.是用used提问的啊。回答不可能出现did. 再答: 如果你要简单的回答就是did,如果不想简单的就是yes, i used to 再问: 就是说回答是Yes ,I used to .\NO ,I usedn't to,对吗? 再答: 嗯是的