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sa théorie

his theory

→ son
phrase Rare #41,514
his theory Can also mean “her theory” or “its theory” depending on context. The possessive sa changes to match the noun, not the owner’s gender.
FR: Je ne comprends pas sa théorie.
EN: I don't understand his theory.

Monsieur Johnson insiste sur sa théorie.

Mr. Johnson insists on his theory.

D'où Dieu, et sa théorie des probabilités.

Hence God, and his theory of probability.

Tout ça, c'est Bogomolov et sa théorie ridicule.

This is all Bogomolov and his ridiculous theory.

— Moscou ne croit pas aux larmes (1980)

Sa théorie mérite d'être prise en compte.

His theory deserves to be taken into consideration.

Je ne peux trouver absolument aucune faille dans sa théorie.

I can't find absolutely any flaw in his theory.