Ciao Marzia, "how come?" corrisponde a "come mai?":Volevi dire how can o si dice anche how come...?
How come? INFORMAL
used to ask about the reason for something:
So how come you got an invitation and not me?
"I don't think I'll be able to go swimming tomorrow." "How come?"
I'll bet some of the native speakers will object to that colloquial "not me" and tell us we should use "I didn't" instead
Edit: scusa, Paul
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