whold和will的用法

would 是will的过去时态
will一般用于将来时态中
还有表示意愿的时候用
would 常用于would like to do想要做某事
还用于虚拟语句中,对将来的虚拟用would

而would一般是“愿意”的意思，但也可以做will的意思
其实一般都是would you like...而当作will也不是不可，而且准确的说，如果你把will放在would的地方也可以，但会很别扭“will you like some ...?"……所以简单的解释就是说委婉用语吧，可是实际上用还是要看场合，愿意一般就用would 要做什么就用will了

will
1）表意愿，用于各种人称陈述句。
I will do anything for you. 我愿为你做任何事。
None is so blind as those who won´t see. 不愿看的人眼最瞎。
If you will read the book, I´ll lend it to you. 如果你愿意读这本书，我会把它借给你。
2）表请求，用于疑问句。
Will you close the window? It´s a bit cold. 请你把窗户关上好吗？有点冷。
Won´t you drink some more coffee? 再来一点咖啡好吗？
3）表示某种倾向或习惯性动作。
Fish will die out of water. 鱼离开水就不能活。
The door won´t open. 这门打不开。
The boy will sit there hour after hour looking at the traffic go by.
那男孩常常坐在那里好几个钟点，看着车辆行人通过。

would
1）表意愿。
They would not let him in because he was poorly dressed.