辨析used to, be used to do和be used to doing

（1）used to表示過去的習(xí)慣性動(dòng)作,過去如此,現(xiàn)在不再這樣了.常譯作“過去常?！?如：
He used to play basketball when he was young. 他年輕的時(shí)候常常打籃球.
There used to be an apple tree here. 過去這兒曾經(jīng)有棵蘋果樹.
（2）be used to do表示“被用來做某事”.如：
Wood is often used to make desks and chairs. 木頭常常被用來制作桌椅.
（3）be used to doing /n. 表示“習(xí)慣于”某一客觀事實(shí)或狀態(tài),不強(qiáng)調(diào)動(dòng)作,to是介詞,后面接名詞或動(dòng)名詞.如：
He is used to hard work. 他習(xí)慣于艱苦的工作.
She is not used to eating Chinese food. 她不習(xí)慣吃中餐.