Could you tell me where the copier is,please?这Could you tell me where the copier is,please?这里的could能换成can嘛,为什么要用could呢?

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Couldyoutellmewherethecopieris,please?这Couldyoutellmewherethecopieris,please?这里的could能换成can嘛,为什么要用co

Could you tell me where the copier is,please?这Could you tell me where the copier is,please?这里的could能换成can嘛,为什么要用could呢?
Could you tell me where the copier is,please?这
Could you tell me where the copier is,please?这里的could能换成can嘛,为什么要用could呢?

Could you tell me where the copier is,please?这Could you tell me where the copier is,please?这里的could能换成can嘛,为什么要用could呢?
在语气上could 更加委婉客气