He used to be our monitor. 他以前当过我们的班长. He used to be a team leader. 他干过队长. He's much fatter than he used to be. 他比过去胖多了. He used to be a dunce at school. 他上学时曾是个笨学生. It used to be difficult to get drinking water here. 过去这里吃水很困难. We used to be happier. 我们以前很快乐.
