2、be used to doing 表示习惯于做某事或习惯于某事
例句:I am used to cleaning the room. 我习惯于打扫房间
You are used to playing game. 我习惯玩游戏
ps: be used to doing =get used to doing习惯于做某事
3、used to do表示过去经常做某事 （但是现在不做了）
例句：I used to go to school .
I usde to eat junk food.
used to be 表示过去是什么样的 （但现在不是）
例句：I used to be a bed student
You used to be a good student
4、be used for doing 被用于做某事
例句：The computer is used for playing game.电脑被用于玩游戏
be used to do sth 被用于做某事
例句：The computer is used to play game.电脑被用于玩游戏
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