现在还不吃英语

I doesn'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~~

But they don't eat it now.But they don't have it now.

I haven't had the dinner until now!Don't you care me?我到现在还没吃饭，你不在意吗？！谢谢采纳，祝学习进步！！