1、be used to do“被用來做……”
Wood is often used to make desks and chairs.木頭常常被用來制作桌椅。
Computers can be used to do a lot of work now.如今電腦可用來做許多事。
2、be used to doing“習慣于……”
I am used to cleaning the room.我習慣于打掃房間
You are used to playing game.我習慣玩游戲
She is not used to eating Chinese food.她不習慣吃中餐。
3、used to“過去常常”
經常與be used to do進行辨析，表示過去的習慣性動作，過去如此，現在不再這樣了，譯為“過去常�！�。例如：
He used to play basketball when he was young.他年輕的時候常常打籃球。
There used to be an apple tree here.過去這兒曾經有棵蘋果樹。
He used to get up early.過去他經常早起。