1.基本用法特點

used to的意思是“過去經(jīng)?！保渲械膖o是不定式符號，不是介詞，所以其后接動詞原形(不接動名詞)。如：

He used to live in Paris. 他過去一直住在巴黎。

2.Be used to do sth. 被用來做某事

例句：Wood is often used to make furnitures.

3.Be used to doing sth, 習慣于做某事

例句; He is used to geting up earlier.

4.Used to do sth, 過去是，過去常常

例句: Thet used to play computer games together.