Ann returned the book to the library yesterday.改为一般疑问句后return要加s吗?
问题描述：
Ann returned the book to the library yesterday.改为一般疑问句后return要加s吗?
答
Did Ann return the book to the library yesterday?
不需要哦~因为does do did这类助动词后面都用原型哦~这里是过去所以用did