我请客的英文有以下几种说法：
1.It's on me
on me 有“我请客、算我头上”的意思
It's on me相当于“这顿算我头上”
例句：
Let's dine out this evening. It's on me.
我们出去吃饭吧，今天我请客。
2.It's my treat
treat 不仅有“对待”的意思
还有“款待、请客、做东”的意思
释义：(treat someone to)provide someone with (food, drink, or entertainment) at one's own expense （用食物、饮料或娱乐）款待某人
例句：
He treated her to a slap-up lunch.
他请她吃了顿高档午餐。
‘My treat,’ he insisted, reaching for the bill.
“我做东。”他手伸向账单，坚持说道。
3.spring for
虽然说"spring"是“春天” 的意思
可是大家千万别把"spring for"
误解成和春天相关的短语
其实真正意思也是“请客”
例句：
I'll spring for the drinks tonight.
今晚的饮料我来付账。
spring for 是美国和澳洲的俚语
它在词典中的释义是：
pay for, especially as a treat for someone else
付账（尤指请客）
Incana1992
