老板今晚请我们吃饭, 英语怎么说?

Boss has invited/invited us to have supper tonight.
肯定邀请过了,用过去式,或完成式.
supper 是名词,要用have supper

treat to [简明英汉词典]
款待, 招待
是主人招待客人的意思,不是老板请客那种

老板今晚请我们吃饭:Our boss will treat us to dinner tonight.
treat sb. to dinner:请某人吃饭，是很常用的短语

My boss will treat us a dinner tonight.

treat 表示“请客”

口语话的是：Boss will treat us tonight!

We are invited to dinner with Boss tonight.