knows how to speak
Sa parlare tedesco, per non parlare dell'inglese.
He can speak German, not to mention English.
Sa parlare sia l'inglese che il francese.
He/She can speak both English and French.
He can speak eight languages.
Sa parlare fluentemente il francese.
He can speak fluent French.
He can speak Berber.
He can speak three languages.
He can speak Portuguese.
He can speak Japanese.
He can speak Chinese.