could you tell me when the train leaves?这里为什么不用will leave,为什么可以这样用?理由.如果不对,分析一下句子成分和用法.重在理由.

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)? what does she do?Could you tell me?Could you tell me_____ ______ ____为什么？