Which one should you use?
The form su is used when the thing being possessed is singular, whereas the form changes to sus if the objects being possessed are plural. Note that su is also the form used for "your (singular/formal)", which can make it ambiguous without context.
Is it said differently in some regions?
In many Latin American countries, su is used to address a group formally. While vuestro/vuestra is used for "your (plural)" in Spain, it is not the standard for this meaning in Latin America.
How does it change in a sentence?
The form changes to sus if the objects being possessed are plural.
How do you pronounce it?
/su/
What mistakes should you avoid?
English speakers often mistakenly use vuestro/vuestra for "your (plural)" in Latin American Spanish.
Did you know?
- The word su shares the same ancient Indo-European root as the English word 'self', stemming from the root *swé- which denotes reflexive or possessive identity.
- In many Latin American countries, using vuestro to mean 'your (plural)' can make you sound like a character from a Spanish period drama or a dubbed movie.
- Because su is so ambiguous, Spanish speakers often avoid it by using the phrase de ustedes to clarify that they mean 'your' rather than 'his' or 'her'.
Examples in context
- Vuestra empresa es muy importante para nosotros.Your company is very important to us.
- Es su casa.It is your house.
- ¿Dónde está su coche?Where is your car?
Example conversation
Lucía meets Daniel and his wife, who are walking their dog in the park.
- Lucía¡Qué lindo es su perro!Your dog is so cute!
- DanielMuchas gracias, Lucía.Thank you very much, Lucía.
- Lucía¿Cuál es su nombre?What is his name?
- DanielSe llama Max.His name is Max.
Sources
- Pronunciation: Wiktionary entry su, CC BY-SA 4.0, dump of 2026-09-26.
- Word origins: Wiktionary entries su, CC BY-SA 4.0.