would是一个助动词，或者叫做情态动词，它有两种用法：第一种用法叫would do，普通的过去将来时指的是在当时的时候将来要发生的事。另外一个用法是虚拟语气，would do、would have done，这些都是虚拟语气。
扩展资料
A change of job would do you the world of good.
换一下工作会对你大有好处。
He would do well to concentrate more on his work.
他最好还是更加集中精力在工作上。
It was a chance meeting that would change my life.
那次偶然的会面改变了我的一生。
Nothing, but nothing would make him change his mind.
没有什么绝对没有什么会使他改变主意。
Someone might find out, and that would never do.
也许有人会发现，那是绝对不行的。
