1.want to do后面只能接动词不定式,这是定律,好好记住就行,举个例子: I want to have a swim.我想去游泳 2.regret 后面既可以接动词不定式to do;也可以接动名词ing regret to do sth.很遗憾地/抱歉地做...(事情还没有做) I regret to tell you that you can't pass the examination.我很遗憾地通知你你不能通过这次考试. regret doing sth.很遗憾/后悔做了...(为已经做过的事而感到...) I regret disturbing yo so long.我很抱歉打扰了你那么久.