请问could,would有什么区别?

请问could,would有什么区别? 请问could和would在虚拟语气中有什么区别?请问could和would在虚拟语气中有什么区别. 请问can和could有什么区别? 英语：Could和Would的用法有什么区别? Could you...?和would you...?有什么区别? it would be和it could be有什么区别 should can may would could 有什么区别 should can may would could 有什么区别 could you mind 与would you mind 有什么区别_____you mind fetching a book for me _____ .A would ; certainly not B could ; you had better not 请问第一空可以填could Could you please/would you pleaseCould you please...和Would you please...有什么区别? Could you和would 什么区别? 虚拟语气中的would have done 与could have done结构 有什么 区别?什么时候用would什么时候用could? it would be great if you could .请问It would be great if you spoke chinese和It would be great if you could speak chinese有什么区别吗?应该用it would be great if he could work in China 还是 It would be great if he worked in China?怎么 would、should、could和might的区别我想问下,这四个有什么区别. I wish I could//would have 有什么区别I wish I could have I wish I would have 有什么区别呢,最好能举个例子 请问can和could、may和might有什么区别 虚拟语气中would,should,might,could有什么区别书上说，表将来用would/should/might/could+动词原形表将来，没说区别 can could would 的区别can you do.could you do...这两个都没问题,那would you do...可以吗有什么区别吗