used to be和would的互用.He used to be a worker
问题描述：
used to be和would的互用.He used to be a worker
would表示过去的一种习惯，不表状态。但是听说He used to be a worker可以换成He would be a worker。
他过去是一个工人，不是表示一种状态吗？为什么可以用would？
答
He used to be a worker 和 He would be a worker.两个句子有不同意思.
For example ,
He used to be aworker . He is a teacher now .
He would be a worker . If he quit his job as a teacher .would不是不表状态吗？be a worker不是一种状态吗？两个句子有He , 有be a worker , 如果used to = would , 用数学去解释两个句子是一样是可以理解的！但 used to 根本 跟 would 不一样。