1. This dinner is on me. Please order whatever you want to have.

晚餐我请，你想吃什么随便点吧。

2. My treat/It's my treat today.

今天我做东。

3. Let me foot/pay the bill tonight. Next time you'll treat.

今晚我付账吧，下次你请客。

4. I'm paying tonight.

今晚我请客。

5. Listen, please don't argue with me. Let me pick up the tab/bill this time.

行了，都别跟我争啦。这次我来买单吧。