It's my treat. 我请客. It's on me. 我请客. Let me pay. 让我付钱. Be my guest. 我请客. I'm paying. 我来付钱. I got it. 我买单. Don't say a word. 不要争. It's my pleasure. 这是我的荣幸. Next time you can pay. 下次你可以付.
