could you tell me your name这里为什么要用could?

could you please tell me could can you tell me?can you tell me?could you tell me?区别? Could you tell me about you? could you tell me you telephone number? Could you tell me your home ____number Could you tell me something about your Could you tell me when (start) tomrrow Could you tell me your name?回答------ could you tell me the story c____ 用could you tell me 造句 could you tell me where is the could you tell me ( )the bus stop ( Could you tell me the plan ( ) detail? where do you work?could you tell me?（合并句子）could you tell me ___you__? could you tell me what i should do?=could you tell me ___ ___ ___? me:could you tell me something about急 Excuse me,could you please tell me (电影什么时候开始)? Excuse me,could ou tell me--------?-Certainly.Go straight ahead and you 'llExcuse me,could ou tell me--------?-Certainly.Go straight ahead and you 'llA.where the post office is B.when you will visit the museumC.where is the post office D.when will yo