what for和why的區(qū)別：含義不同、詞性不同、用法不同。what for含義為“為何、處罰”，表示動作的目的，常用不定式回答；why可作副詞、名詞和感嘆詞，含義為“為什么、…的原因、哎呀、理由”，常用because回答。
一、what for的含義及用法
what for意為為何;為什么;…怎樣;處罰。
例句：And I can't even remember what for.
但我想不起來是因為什么
What's for lunch? I'm absolutely ravenous.
午飯吃什么？我餓死了。
We had some wine ─ or what passes for wine in that area.
我們喝了一些酒——或是那個地區(qū)當作酒的東西。
Even to this day we don't know what happened for sure.
即使到現(xiàn)在我們也不確定究竟發(fā)生了什么。
What matters for most scientists is money and facilities
對多數(shù)科學家來說，資金和設(shè)備是至關(guān)重要的。
What's for afters? is it fruit and custard?
最后一道菜是什么？是水果和乳蛋糕嗎？
Since then, packaged, pre-prepared meals have been what's for dinner.
從那時起，預先準備好的包裝食品就成了晚餐。
二、why的含義及用法介紹
why可作副詞、感嘆詞和名詞，意為為什么，為何;(反問，表示不必)何必;哎呀，呦，喲，嗨；原因;理由;說明;難解的問題。
例句：Tell me why you did it.
告訴我你為什么這樣做。
Why get upset just because you got one bad grade?
何必因為一次成績不好就想不開呢？
That's why I left so early.
這就是我早早離去的原因。
Why, it's easy─a child could do it!
嗨，這容易得很，連小孩子都干得了！
It's not for me to say why he left.
不適宜由我說出他離開的原因。
There's no earthly reason why you shouldn't go.
你完全沒有理由不去。
Always offer a reason for why you want to develop a particular skill.
在你表示自己想培養(yǎng)某種技能時一定要說明原因。
