Understanding “Su” in Spanish: A Complete Guide
The Spanish word “su” is one of the most common and versatile possessive adjectives in the language. It translates to his, her, its, your (formal), or their depending on context. Mastering “su” is essential for clear communication in Spanish, as it appears in everyday conversations, written texts, and formal documents. This guide explains its meaning, usage, and common pitfalls.
What Does “Su” Mean in Spanish?
“Su” is a third-person possessive adjective that indicates ownership or relationship. Unlike English, which has separate words for his, her, its, and their, Spanish uses “su” for all these meanings. It agrees in number with the noun it modifies (singular or plural), not with the owner.
Meanings of “Su”
- His – referring to a male owner: Su casa (his house)
- Her – referring to a female owner: Su libro (her book)
- Its – referring to a thing or animal: Su color (its color)
- Your (formal singular) – used with usted: Su coche (your car)
- Their – referring to multiple owners: Sus amigos (their friends)
When to Use “Su” vs. Other Possessives
Spanish has a set of possessive adjectives that must match the noun they modify. Here is a quick comparison:
| Person | Singular | Plural |
|---|---|---|
| 1st person singular | mi | mis |
| 2nd person singular (informal) | tu | tus |
| 2nd person singular (formal) / 3rd person | su | sus |
| 1st person plural | nuestro/a | nuestros/as |
| 2nd person plural (informal Spain) | vuestro/a | vuestros/as |
| 2nd person plural (formal) / 3rd person plural | su | sus |
Notice that “su” is used for both singular and plural formal you (usted and ustedes) as well as for third person. Context—such as the verb conjugation or prior reference—clarifies the owner.
Examples of “Su” in Sentences
Here are practical examples showing how “su” works in different contexts:
Possession
- Él perdió su teléfono. (He lost his phone.)
- Ella dejó su mochila en el autobús. (She left her backpack on the bus.)
- El perro mueve su cola. (The dog wags its tail.)
- Señor García, ¿puedo usar su computadora? (Mr. García, may I use your computer?)
- Los estudiantes entregaron sus tareas. (The students turned in their homework.)
Relationships
- María visita a su abuela cada fin de semana. (María visits her grandmother every weekend.)
- Juan y su hermano juegan fútbol. (Juan and his brother play soccer.)
Common Mistakes with “Su”
Even advanced learners sometimes confuse “su” with other words. Here are the most frequent errors:
Confusing “Su” with “Tu”
“Tu” (without accent) is the informal second-person possessive (your). “Su” is formal or third person. Mixing them can sound disrespectful when addressing someone formally. For example, saying “Tu coche” to a boss may be too informal; use “Su coche”.
Forgetting the Plural Form “Sus”
When the possessed noun is plural, “su” becomes “sus”. Example: Su libro (his book) vs. Sus libros (his books). The owner remains singular, but the noun changes.
Ambiguity and Clarification
Because “su” can mean his, her, its, your, or their, ambiguity sometimes arises. Spanish speakers often clarify by using de él, de ella, de usted, de ellos after the noun. For instance:
- El libro de él (his book) instead of just su libro if the owner is unclear.
“Su” vs. “Suyo” – What’s the Difference?
Another common point of confusion is between the possessive adjective “su” and the possessive pronoun “suyo”. “Su” always comes before a noun, while “suyo” replaces the noun and agrees in gender and number.
- Su casa es grande. (His/her/your/their house is big.) – adjective
- La casa es suya. (The house is his/hers/yours/theirs.) – pronoun
Regional Variations and Formal Usage
In Spain, the informal plural possessive vuestro is common, but in Latin America, su is used for both formal and informal plural you (ustedes). Always consider your audience: using su is safe in most contexts, especially when addressing strangers or in professional settings.
Practice Exercises
Test your understanding of “su” with these fill-in-the-blank sentences. Choose the correct form (su or sus):
- Ana dejó _____ llaves en la mesa. (her keys)
- El gato lame _____ pata. (its paw)
- Señores, ¿dónde están _____ maletas? (your luggage)
- Los niños terminaron _____ tarea. (their homework)
Answers: 1. sus, 2. su, 3. sus, 4. su
Conclusion
The word “su” is a cornerstone of Spanish grammar. By understanding its multiple meanings and practicing its use, you can express possession clearly and politely. Remember to pay attention to context and use the plural form sus when needed. With consistent practice, using “su” will become second nature.
For more Spanish grammar guides, explore our other articles on possessive adjectives and pronouns.