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 25, 2010ย ยท Maybe I could say the question with why is a blunt question, whereas the question with how come indicates we admire that the person spoken to has such great knowledge about โ€ฆ

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

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