be used to do表示“被用来做某事”，be used to doing/n.表示“习惯于”某一客观事实或状态，不强调动作，to是介词，后面接名词或动名词。

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。