This page is about the conversational phrase how come?
You can say this if you want to know why something's happened, or why a situation exists.
- "Tomorrow's meeting has been cancelled."
"Really? How come?"
"Arthur said he can't make it."
- "I'm quitting my job."
"How come? I thought you liked it."
You can say "How come?" if you want to know
Contributor: Matt Errey