在英语中，如果你想请别人吃饭，可以使用以下几种表达方式：

1. "It's my treat."

意思：这顿我请。

例子："Let's go eat. It's my treat."

2. "It's on me."

意思：这顿算我头上。

例子："Let's grab some Chinese food. It's on me."

3. "This is my round."

意思：轮到我了。

例子："Let's dine out this evening. This is my round."

4. "I'm paying for everything."

意思：我支付所有费用。

例子："Tonight's dinner is special, I'm paying for everything."

5. "Dinner's on me."

意思：晚餐我请客。

例子："Dinner's on me tonight, let's go to that new restaurant!"

使用这些表达时，可以根据具体场合和与对方的关系选择合适的说法。希望这些建议对你有帮助!