自己英语水平不好,明天要接待3个美国人,如何让他们讲的慢一点好让我听懂,又显得有礼貌?

I have to say that I can only speak a little English,would you please slow down your speed?其实直说就可以了,他们不会介意的.要显得有礼貌,就时刻注意多用please,thank you,sorry,excuse me等用语