谢谢牙仙一贯的的勤于动脑！！补课中有例句。

来源: 于 2011-10-19 14:39:41 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

谢谢牙仙的一贯的勤于动脑！

补课中有例句：

(1) “have to, had better, used to”要用下列方式反问：

They used to smoke, didn't / usedn't they?

所以，你这句话可以是：

He used to be a sailor, didn't/usedn't he?