Nov 27, 2018 · Why is a just a rather odd wh -word. Its distribution is very limited -- it can only have the word reason as its antecedent, and since it's never the subject it's always deletable..
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.
