曾经做某事用英语怎么说短语

"used to do something" 是表示曾经做过某事的短语。这个短语来自英语中的动词"use"，表示"使用"或"运用"，加上"to"和动词原形形成。

例句:

I used to play the piano every day when I was a child. (我小时候每天都弹钢琴。)
He used to work as a teacher before he became a lawyer. (他以前是老师，现在是律师。)
They used to live in the city, but now they live in the countryside. (他们曾经住在城里，现在住在乡下。)