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Thus we say: You never know, which is why. but You never know. That is why. And goes on to explain: There is a subtle but important difference between the use of that and which in a sentence,. Possible Duplicate: Where does the use of “why” as an interjection come from? This is a common English phrase that I'm sure everyone has heard before. However, I find it puzzling. Dec 4, 2018 · For why' can be idiomatic in certain contexts, but it sounds rather old-fashioned. Googling 'for why' (in quotes) I discovered that there was a single word 'forwhy' in Middle English. Jan 16, 2011 · Why have a letter in a word when it’s silent in pronunciation, like the b in debt? Can anyone please clarify my uncertainty here?