used to是英语单词通常出现在口语对话和书面语中，表示过去的经历、习惯、兴趣等等，
但除此之外，used to还有很多其他的用法，在下面我们来一起学习一下。
1.表示曾经的情境
例句：I used to live in Shanghai.
2. 表示过去的经历
例句：I used to be a teacher.
3.表示习惯或者兴趣
例句：When I was young, I used to swim every day.
4.used to能缩写为used’t
例句：He usedn’t to speak English very well.
5.used to 动词原形
例句：used to eat/used to do
6. be/get used to 名词等
例句：I’m not used to driving on the left.
7.I’m used to 动名词
例句：I’m used to getting up early.
8. There is used to do sth.
例句：There used to be a big tree in front of the house.
9.used to do/used to doing
例句：I used to eat spicy food. / I’m not used to eating spicy food.
10.used to have done
例句：I used to have studied English when I was at university.
