This can be very difficult,but could you come with me,please

could you come with me,please?这里为什么用could 而不用can 呢? ----Could you please come to the museum with me this afterno Could you please hang out with me? Peter _____ come with me this evening,but he isn't very sure Did john invite me?Yes,but you can't come can you?No,I'll be But some things can be very difficult是什么意思 I am very happy that you can come here to see me!please don' Could you please help me （out|with） this math problem? Please come with me could you please please dance with me同义句 I think I am very lonely, you could be with me If, Sure, Wou you come can play to me with