teach和taught的区别跟用法?

teach和taught的区别跟用法? who taught和who did teach的区别 who taught和who did teach有何区别 taught和teach什么关系? teach的用法Who taught _____ English last term?A.them B.their C. ,one和that的用法跟区别 中文“和”跟“与”用法的区别 who taught和who did teach teach 的用法和结构是什么? taught和teach,怎么区分?什么时候用taught什么时候用teach teach sb.to do和teach sb.doing的区别 teach sb to sth和 teach sb sth的区别