Why don't we have lunch? My treat. 我们去吃午饭吧，我请客。
treat someone to something 请某人客
It's my treat. 我来清客吧。
I'll treat you to lunch/ice cream/coffee. 我请你吃午饭。
Let's go to the movie. I'll treat everybody. 我们去看电影吧，我请大家。
Let's go to a bar. It's on me. 我们去酒吧坐坐，我请客。
Dinner's on me. 晚饭我来请客。
We should get dinner some time. It's on me.我们应该找个时间吃顿饭，我来请。
On me this time. 这次我来请吧。
I insist it all on me.这次一定得我付账。
Let's get a drink. I'm buying. 我们去喝一杯吧，我请客。 drink酒精饮料
Can/May/Could i buy you a drink? 我能请你喝一杯吗？
Great. A beer would be fine, thanks. 好啊，一杯啤酒就可以了，谢谢了。
Can I buy you a cup of coffee? 我们能找个地方聊聊吗？
