How would you say: "How is it that you know French?"
Comment est-il que tu sais le français?
Merci à tous.
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Sign up to join this communityAn idiomatic, casual way would be:
Comment ça se fait que tu parles/comprends/lis le français ?
One century ago, you might have heard :
Comment se fait-il que tu saches le français ?
It would be still understood but this form is outdated or at least very literary.
If you insist to use savoir, that can be:
Comment ça se fait que tu sais parler français ?