used to be 以前是;
in the past 在过去;
in former times 从前;
其他相关短语：
Used to be quiet 过去常常安静；
used to be common 过去很普遍；
used to be alone 曾经孤单 ;
that used to be 原来是 ; 曾经是 ;
Used to be like 曾经很喜欢
相关介绍
once：
adv. 仅一次;一次;曾;曾经;
I once met your mother.
我曾经见过你母亲。
Since the success of her novel, people shake her hand who once wouldn't have given her the time of day.
自从她的小说获得成功之后，曾经懒得答理她的人也跟她握起手来。
He was once known as a champion of social reform.
他曾经是社会改革的拥护者。
Coincidentally, I had once found myself in a similar situation
巧得很，我曾经碰到过类似的情况。
