I don't know why, but it seems to me that Bob would sound a bit strange if he said, "Why is it that you have to get going?" in that situation.
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.
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Why do people use the latter terminology?
For one thing, I find it confusing.
It doesn't help that BCE is similar to BC.
But moreover, there is only one letter of difference between the two terms, whereas.