Why is used here as an interjection. According to Merriam-Webster: โ€”used to express mild surprise, hesitation, approval, disapproval, or impatience In my โ€ฆ

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, โ€ฆ

Nov 27, 2018ย ยท 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. Consequently it โ€ฆ

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Mar 22, 2023ย ยท The questions How? and Why? only have similar answers where the reason for something is the cause. This is the case for a question like "Why is the boy so big?" โ€” he has eaten โ€ฆ

Jan 16, 2011ย ยท Why have a letter in a word when itโ€™s silent in pronunciation, like the b in debt? Can anyone please clarify my uncertainty here?

The grass is wet because it rained last night. This seems the simplest and most elegant expression of the meaning. I am always suspicious of "reason (s)" and "why" being next to each other. There can โ€ฆ

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