do we know
Que savons-nous de Celtris III ?
What do we know about Celtris III?
— Star Trek: The Next Generation - Chain of Command (1992)
Comment savons-nous ce que nous croyons savoir ?
How do we know what we think we know?
— Cours, Lola, cours (1998)
How do we know?
What do we know about her?
What do we know about him?