首先，在英美国家 "你吃饭了吗?" 不是一句问候语。
千万不要见人就问"你吃饭了吗?"。
如果出于澄清的需要，你不得不问，那么你一定要问明”早中晚”饭。
这时你可以用下列方法提问：
John: Did you have your breakfast (lunch,dinner) yet?
Jane: Yes I did.
John: Great. Let's go now to the park now.
John: Did you have your breakfast (lunch,dinner) yet?
Jane: No. I'm sorry. I got up too late.
John: No problem. Let's stop at McDonald first. Then we will go to the park.