vs
QUICK ANSWER
"A ustedes" is a phrase which is often translated as "you", and "a su" is a phrase which is often translated as "to his". Learn more about the difference between "a ustedes" and "a su" below.
a ustedes(
ah
oos
-
teh
-
dehs
)A phrase is a group of words commonly used together (e.g., once upon a time).
a su(
ah
soo
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. to his (masculine)
Diego solía escribir a su mamá todos los días desde el frente de guerra.Diego would write to his mom every day from the warfront.
b. to her (feminine)
La mujer había mentido a su marido para que no se disgustara.The woman had lied to her husband so he wouldn't get upset.
a. to their
La encuesta muestra que los votantes siguen siendo fieles a su candidato.The poll shows that voters remain loyal to their candidate.
3. (formal) (possessive; second person singular)
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).