can you；could you有什么区别?除了语气上的不同 两者是不是可以通用的?

I could kill you 和I can kill you有什么区别? can you tell me 和could you tell me 语气上有什么区别? i could take you up和i can take you up 有什么区别.求详解. Could you please ...和Could you...有什么区别 you can stay和you could stay有什么区别can 和 could 有什么区别?用法也有什么区别? 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 Could I look at your pictures?Yes,Of course you ___.A.could B.can 到底有什么区别呢? can you give me some water和could you give me some water 有什么区别啊? can you give me some discount?could you give me some discount?这两个句子有什么不同呢 can you；could you有什么区别?除了语气上的不同 两者是不是可以通用的? 什么时候用would you.will you,can you,could you! 有could you please do .有 can you please do .有could you please do .......的用法。有 can you please do ..................的用法么？ Could you...?和would you...?有什么区别? Can you please,Would you please,Will you please,Could you please后加动词的什么形式 Could you please/would you pleaseCould you please...和Would you please...有什么区别? could can you tell me?can you tell me?could you tell me?区别? could you give me some advice和could you give me any advice 有什么区别 you could do 与 you can do 有啥区别可以互换吗