can you...could you...怎么区别?还有may,should初二上学期学了can you...could you...怎么区别呢?还有may,should

什么时候用would you.will you,can you,could you! could can you tell me?can you tell me?could you tell me?区别? Can/Could you please句型的用法 could you和can的用法. Nobody could ever replace you为什么用could不用can YES,AND YOU CAN SURE YOU COULD DO IT could you tell me .what can I do for you I can't follow you.could you speak more c()? Only by working hard succeed.A.can you B.you can C.could you D.you could could you can you may you will you 的区别?could i may i can i呢 could you 和 can you 的区别?例如,Could you do me a favor?Can you give me some food? if you were blind ,you[ ]can还是could see nothingif you were blind ,you[ ]can还是could see nothing could 是can的过去式,那为什么could you help me 用could,又不是过去式 改错-Could you help you?-Yes,I could.答案把yes,I could改成yes,I can,为什么呢? what would you do if you ( )live your life over again?为什么用could/a.can b.could为什么could Or if you can think of anything else that could （）can't find ()pen.Could you help ()?填空 Can you love I could think of me是什么意思