Dictionary
How come
adverb
Why; why is it; for what reason or purpose?
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The expression "How come" is correct and usable in written English.
It is typically used as an informal way of asking "why" or "how", although it is often used to mean "why" specifically. For example: "How come you decided to quit your job?".
Exact(60)
"How come?" she said.
How come she didn't notice?
"How come everybody says that?
How come us?
How come you're here?
"How come?' he asked.
How come the sunlight?
"How come?" he said.
How come "Neen"?
"How come?" I persisted.
How come their database is seized?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com