It's just the three of you,is it?这句子有个问题
文章是说有人在饭店定了晚饭,原来定了5人,但只到了三个.于是接待员问他门：“It's just the three of you,is it?”
这里不是应该用“...,isn't it?是特殊用法还是口语要求不严格,可以随便用?