prenais pour

was mistaking for; used to mistake for

→ prendre
phrase Common #2,359
was mistaking for; used to mistake for This is an imperfect-tense form of prendre pour. It can mean mistakenly identifying someone or something as another person or thing. The reflexive form se prendre pour means to think oneself to be or act as if one were something else.
FR: Tu me prenais pour ton frère.
EN: You mistook me for your brother.

Je te prenais pour une formidable machine.

I thought you were a formidable machine.

— Avengers : Infinity War (2018)

Et dire que je te prenais pour un Américain cinglé.

And to think I thought you were a crazy American.

— Black Panther (2018)

Je vous prenais pour une statue, et je découvre que vous avez un coeur.

I took you for a statue, and I discover that you have a heart.

— Devdas (2002)

Je le prenais pour un gros rat.

I mistook him for a big rat.

— Les Sept Samouraïs (1954)