我还没有吃饭。用英语怎么说，另外过去时又是什么样的

I haven't had lunch/dinner.

I didn't have lunch/dinner.

I have not eaten yet.
这句话用完成时态表达会地道些，不适合用过去式说呢，因为你说的当时就是没有吃饭，就是说到现在为止都没有吃，而不是过去没吃，呵呵~~

I doesn't have lunch/dinner.