Question

would you 和will you 和could you ,三个的区别，语气哪个更强？平时讲话用哪个好？

不要教科书上的那种回答，谢谢

Answer 1

语气最强的毫无疑问是will，事实上，will一般不会被用在表示请求的对话中，will you 一般都是在很客观的询问对方是否会做某件尘春事，不包含自己希望其做事的意愿悔兆。
would you 和 could you日常都经常用，不过语义稍有不同，个人感觉可能是would比较强硬一点，表示希望对方做某事，而could you更有一种询问对方是否可做某事的感觉。
would you 后派前耐面有时加 like to 或者 mind doing，表示是否想或者是否介意做什么事。

Answer 2

would 是最有礼差轮貌的, 其次虚咐信简者是 could you , 最后是 will you
Would you open the window please?
Could you open the window?
Will you open the windw?
Would you mind telling me the truth?

Could you tell me the truth?
Will you tell me the truth?