“今天我宴客”英语怎样说？

我宴客 it's my treat

(1) it's my treat/my treat “我宴客”

(2) treat作动词，“宴客，招待，招待”

(3) treat sb. to sth. “招待或人某物，请或人吃某物”

例

He's treating her to a meal, but his own portion is small.

他请她用饭，本人那份点的却很少。

Can we get another bottle of champagne for the table? Don't worry. It's my treat.

能给我们桌再来一瓶香槟吗？别担心，我宴客。《生存大爆炸》

我宴客 it's on me

(1) on有“由……付钱”的意思

(2) on sb.“由或人付出”，白话

(3) it's on me “我宴客”

(4) this is on me “这顿我请”

例

I'll get my purse, and dinner is on me, okay?

我去拿我的包，晚饭我请，好吗？

By the way, this is on me.

特地说一下，这顿我请。

店家赠予 on the house

on the house “店家赠予，无偿”，常用于饭店、酒吧等场合

例

How about a piece of cheesecake on the house?

来块无偿芝士蛋糕怎样样？

It's on the house.

这是本店赠予的。