how do we know

How do we know what we think we know?

Comment savons-nous ce que nous croyons savoir ?

— Run Lola Run (1998)

How do we know he won't betray us?

Comment savoir s’il ne nous trahira pas ?

— The Hobbit: The Desolation of Smaug (2013)

How do we know this Strider is a friend of Gandalf?

Comment savons-nous que ce Grand-Pas est un ami de Gandalf ?

— The Lord of the Rings: The Fellowship of the Ring (2001)

Yeah, if you guys don't have a meeting, how do we know if we want to join?

Oui, si vous ne faites pas de réunion, comment sommes-nous censés savoir si nous voulons y participer ?

— Dead Poets Society (1989)

How do we know enough people are gonna show up?

Comment savoir si suffisamment de personnes seront présentes ?

— Now You See Me: Now You Don't (2025)

How do we know that?

Comment le savons-nous ?

How do we know you're not a cop, huh?

Comment on sait que t’es pas flic, hein ?

— Almost Famous (2000)

Khan, how do we know you’ll keep your word?

Khan, comment savoir si tu tiendras parole ?

— Star Trek II: The Wrath of Khan (1982)