How do these work with en?

Question

If you want the quantifier to be a direct object, would you use it like:
Paul a bu quelques verres de vin hier ---> Paul en a bu quelques hier ??

Answer

Bonjour Hanna !

Actually, "quelques" is a special case here, as you would need to add "-un(e)s" as such:
"Paul en a bu quelques-uns hier."  
-> Though note that this isn't at all colloquial to say "He's had a few.". In French, to express this idea, you'll rather say "Il a pas mal bu hier." or "Il a bien bu.".

You can say "Il en a bu plusieurs." but not "Il en a bu de nombreux." => you'll say "Il en a bu beaucoup." instead :)
 
I hope that's helpful!
À bientôt !