use to be 和 used to be 有什么区别 分别怎么用

没有use to be, 只有used to be, 翻译为“过去常常是……“，这里的be并不是固定搭配，used to就表示”过去常常“,一般的固定搭配为used to do sth. 例句：1丶I used to play soccer in the afternoon. 2丶I used to get up early to finish my homework. 拓展知识 1丶be used to do sth 被用来做某事 例句：Books are used to improve our knowledge. 2丶be used to doing sth 习惯于做某事 例句；She is used to running at dawn. 3丶used to + do："过去常常"表示过去习惯性的动作或状态，但如今已不存在. Mother used not to be so forgetful.