为什么forget doing sth 不用过去式
have difficulty doing sth 为什么不用 to do sth?
forget doing sth怎么用
用forget doing sth造句
forget doing sth 和 forget to do sth的区别
用 forget doing sth 造句,越多越好
11.forget to do sth造句 10.forget doing sth造句 12.enjoy doing s
forget to dp sth和forget doing sth 以及remember to do sth remem
sb was doing sth when sth +动词过去式是什么时态
初二的英语公式比如:forget to do sth.Forget doing sth.Remember to do s
forget doing sth与 forget to do sth 用法的区别
forget doing sth和forget to do sth有什么区别?
forget to do sth.和forget doing sth.以及frighten 和frightened的区别