询问“吃饭了吗”用英文可以表达为："Have you eaten yet?

是的，您提供的英文表达 “Have you eaten yet?” 是询问某人是否已经吃饭的一个非常常见和礼貌的方式。这种问法通常用于询问对方是否已经用餐，尤其是在对方可能还没有吃饭的时候。以下是一些类似的英文表达方式，也可以用来询问某人是否已经吃饭：

1. Have you had dinner yet?
2. Have you eaten lunch?
3. Have you eaten breakfast?
4. Are you having dinner now?
5. Have you eaten today?
6. Did you have anything to eat?
7. Have you dined yet?

每种表达都有其细微的差别，但都传达了相同的基本信息。