su argumento

his/her argument

→ su
phrase Rare #40,364
his/her argument Su can also mean “your” (formal) or “their,” depending on context.
SP: Su argumento me parece convincente.
EN: Their argument seems convincing to me.

Su argumento es lógico.

His argument is logical.

Su argumento carece de lógica.

His argument lacks logic.

Su argumento es más radical que el suyo.

His argument is more radical than yours.

Su argumento era lógico.

His argument was logical.

Su argumento es convincente.

His argument is convincing.

— Porco Rosso (1992)