you could do 与 you can do 有啥区别可以互换吗

you could do worse you could do 与 you can do 有啥区别可以互换吗 Don’t smoke in the meeting-room,____?A) do you B) will you C) can you D) could you Don't smoke in the meeting room,------?A do you B will you C can you D could you you could do what you like when you like. Do you think you could do without help what do you wish you could do?是什么意思 could you please （ ） the bed A make B do C to take D to do Could you tell us __ ? A.how to do B.where doing C.what to do what kind of volunteer work do you think -------?C i could do D could i do what kind of volunteer work do you think -------?C i could do D could i do what kind of volunteer work -------?C i could do D could i do You could do so much better could you please to do something what could you do in your university? could you please doing 还是do could you do me a favor? Could you do me a f____________? what could you do as a volunteer Could/Would you please do sth?could would 是什么词性?