Thus we say: You never know, which is why. but You never know. That is why.
Understanding the Context
And goes on to explain: There is a subtle but important difference between the use of that and which in a sentence,. 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.
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Key Insights
There can.
