你可以用 "We haven't eaten yet." 来表达 "我们没吃饭" 这个意思。

"Haven't" 是 "have not" 的缩略形式，"have not" 是 "have" 的否定形式，意思是"没有"或"没有被"。例如：

I haven't finished my homework yet. (我还没完成作业。)
They haven't seen that movie. (他们没看过那部电影。)

你也可以用 "We haven't had a meal yet." 来表达 "我们没吃饭" 这个意思。"Had" 是 "have" 的过去式，意思是"已经有"或"已经被"。例如：

I haven't had breakfast yet. (我还没吃早餐。)
They haven't had a vacation in a long time. (他们很久没度假了。)

希望这些信息对你有帮助。