Interested in Language
Is this is a common and grammatically correct sentence?
How come he can stay here?
Is it a short form of:
How does it come he can stay here?
I've never heard a sentence like the 2nd one yet...
(1) I hope that you had a nice vacation.
(2) Yes, you seem to be correct: your sentence is an example
(3) Here is a similar example from the famous grammar book written
by Professor Quirk and colleagues:
How come you're so late?
How does it come about that you're so late?
(4) As you said, people do not speak like that.