How Come
WiktionaryText

Adverb



  1. Why; why is it; for what reason or purpose?
    How come you didn't leave when you had the chance?

Usage notes


"How come" differs from "why" in that the word order of the question is the same as that of a statement.
Compare:
You didn't leave. (statement)
How come you didn't leave?
Why didn't you leave?
 
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