这句话为什么用将来进行时?

问题描述:

这句话为什么用将来进行时?
how many nights will you be staying with us?
我觉得是 委婉
Will you be paying by cash or credit card?

how many nights will you be staying with us?这是个对将来的情况的询问,所以用将来时;另外强调 be staying with us 的状态,故用进行时.
Will you be paying by cash or credit card?这个是委婉.