used to的用法小结1used to do sth.表示“过去常常做某事”，将过去和现在对比，暗示现在不做了。to为动词不定式符号，后接动词原形。如：He used to go to school at six oclock.他过去常常六点去上学。2used to do sth.的否定形式主语usednt to do sth.或主语didnt use to do sth.如：He used to play computer games all day.他过去常常整天玩电脑游戏。He usednt to play computer games all day.He didnt use to play computer games all day.他过去不常整天地玩电脑游戏。【注意】usedntused not3used to do的疑问句形式及其答语(1)Used主语to do？回答：Yes，sb.used to./No，sb.usednt to.如：Tom used to watch TV.Use
