第几天英语怎么说比如说TOM要在上海待三天,我如何问他“今天是第几天了”?貌似很简单,可是我竟然不会.我只会问“Is this the first/second/third day?”

第几天英语怎么说比如说TOM要在上海待三天,我如何问他“今天是第几天了”?貌似很简单,可是我竟然不会.我只会问“Is this the first/second/third day?”
第几天英语怎么说
比如说TOM要在上海待三天,我如何问他“今天是第几天了”?
貌似很简单,可是我竟然不会.我只会问“Is this the first/second/third day?”

第几天英语怎么说比如说TOM要在上海待三天,我如何问他“今天是第几天了”?貌似很简单,可是我竟然不会.我只会问“Is this the first/second/third day?”
你可以这样说嘛：how long have you been here?

How long have you been here?
感觉差不多。。。

How long have you been here/in Shanghai?

How long have you stayed in ShangHai until now?
你至今为止在上海待天了？
就是这是第几天的意思了吧

which day is today regarding your stay here?