'Used to' expresses something that was done in the past, and is not usually done now. '

Used to'表示在过去已经做过某事，并且现在不经常做了。
Here are some examples: 这里有一些例子： 

"I used to develop websites."  

我过去经常开发网站。

"I used to jog every day.

"我过去经常慢跑。

"I used to paint."

我过去经常刷墙。

"I used to smoke.

"我过去经常抽烟。

"I used to work from home.

"我过去经常在家里上班。

"I used to live in California."

我过去一直住在加利福尼亚州。

"I used to go to the beach every day."

我过去每天都去沙滩。

"I used to sing in a choir."

 我过去一直在合唱团唱歌。

"I used to like vegetables."

我过去很喜欢吃蔬菜。

"I used to start work at 6 o'clock."

 我过去经常在6点钟开始上班。