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

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

Recommended for you
You may also like