1.基本用法特點(diǎn)

used to的意思是“過(guò)去經(jīng)常”，其中的to是不定式符號(hào)，不是介詞，所以其后接動(dòng)詞原形(不接動(dòng)名詞)。如：

He used to live in Paris. 他過(guò)去一直住在巴黎。

2.Be used to do sth. 被用來(lái)做某事

例句：Wood is often used to make furnitures.

3.Be used to doing sth, 習(xí)慣于做某事

例句; He is used to geting up earlier.

4.Used to do sth, 過(guò)去是，過(guò)去常常

例句: Thet used to play computer games together.