Let me get it 我来买单；我请客
Oh, let me get it. You got it last time.
上次是你请客，这次我来买单。

Split the bill 分开付；平摊
They may not have a lot of money, so they split the bill quite often.
他们或许没有很多的钱，所以他们经常平摊费用。

Go dutch 各付各的；AA制
Why don't we go dutch for dinner tonight?
今晚吃饭我们各付各的怎么样？

Back down 让步
I will always back down to my father and let him pay.
我总会让步于我的父亲，让他买单。

It's on me 我买单
Hey, do you want to have dinner together tonight? It's on me.
嘿，晚上一起吃饭吗？我请客。

I've got it 我来买单
I've got dinner tonight.
我请晚餐。

My treat 我请客
It's my treat tonight.
今晚我请客。