1、be used to do“被用来做……”
Wood is often used to make desks and chairs.木头常常被用来制作桌椅。
Computers can be used to do a lot of work now.如今电脑可用来做许多事。
2、be used to doing“习惯于……”
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
She is not used to eating Chinese food.她不习惯吃中餐。
3、used to“过去常常”
经常与be used to do进行辨析，表示过去的`习惯性动作，过去如此，现在不再这样了，译为“过去常常”。例如：
He used to play basketball when he was young.他年轻的时候常常打篮球。
There used to be an apple tree here.过去这儿曾经有棵苹果树。
He used to get up early.过去他经常早起。