Introduction
Mastering mi, tu, and su is one of the first steps for English speakers learning Spanish. These are possessive adjectives used every day in conversation, on signs, in forms, and on menus. This article explains when and how to use each word, shows practical examples in Latin American Spanish, and highlights common beginner mistakes.
- What are possessive adjectives in Spanish?
- Mi — first person singular
- Tu — second person singular informal
- Su — third person and formal you
- Short vs long possessives: when to use which
- Practical everyday examples
- Common mistakes and how to correct them
- Short practice exercises
- Useful vocabulary related to possession
- Practical tips for classroom and travel
- Common questions from beginners
- Conclusion
What are possessive adjectives in Spanish?
Possessive adjectives show ownership or relationship, similar to my, your, and his/her/their in English. In Spanish, short possessive adjectives come before the noun: mi, tu, su, and others. They do not change for gender, but they do change for number when needed.
Key rule
Place before the noun and match number (singular/plural)
Mi libro = my book
Mis libros = my books
Tu casa = your house (informal)
Tus casas = your houses
Su carro = his/her/your(formal)/their car
Sus carros = his/her/your(formal)/their cars
Mi — first person singular
Mi indicates something belongs to the speaker. It has two forms: mi (singular) and mis (plural).
Examples you will see and use:
Mi teléfono está en la mesa.
Mis llaves no están aquí.
Mi hermano trabaja hoy.
Mis clases empiezan a las ocho.
Tips for beginners with mi
Remember number changes: only add -s if more than one item. Do not change for gender.
Short vs long form: You can also use long possessive adjectives like mío, but those act differently and often follow the noun: El libro mío is less common than mi libro. Stick with mi for now.
Tu — second person singular informal
Tu is used to address someone informally (friends, family, children). Forms: tu (singular) and tus (plural).
Example phrases:
Tu mochila está en la silla.
Tus libros son interesantes.
¿Dónde está tu mamá?
Tus zapatos están sucios.
Common beginner trap with tu
Do not add an accent to tu. The word with an accent, tú, means the subject pronoun you. Compare:
Tú eres estudiante. (you are a student)
Tu tarea está en la mesa. (your homework is on the table)
Confusing these changes meaning. Use the accent only on the pronoun.
Su — third person and formal you
Su is versatile: it can mean his, her, their, or your (formal). Use su for singular possession and sus for plural. Context tells you which meaning applies.
Examples for different meanings:
Su casa es grande. (his house / her house / your (formal) house)
Sus ideas son buenas. (his ideas / her ideas / your (formal) ideas / their ideas)
Su número, por favor. (formal your number)
Su equipo juega mañana. (their team)
How to avoid ambiguity with su
Use clarifying words like a name, noun, or phrase:
La casa de Juan es grande. = Juan’s house (avoids su)
Su casa de ella es grande. (less common and slightly awkward)
El carro de ellos está en el garaje. = Their car
Alternatively, use long possessives: el libro de ella, el libro de él, el libro de usted, el libro de ustedes.
Short vs long possessives: when to use which
Short forms: mi, tu, su + noun. These are most common in everyday speech.
Long forms: mío, tuyo, suyo often follow the noun and agree in gender and number: el libro mío, la casa mía, los libros míos. Beginners should focus on short forms first.
Examples with long forms (for reference):
El perro es mío.
La mochila es tuya.
Las maletas son suyas.
Practical everyday examples
Short real-life lines a beginner might read or say:
¿Puedo usar tu bolígrafo?
Necesito mi pasaporte para el aeropuerto.
Su reservación está confirmada.
Mis hijos tienen clase a las nueve.
Tu nombre está en la lista.
On signs, forms, and menus
Examples you might find on forms or menus:
Nombre y apellido
Dirección
Teléfono de contacto
Correo electrónico
In these contexts, possessives may appear as: número de teléfono, dirección de su hotel, nombre del cliente. Forms often use de + noun to avoid ambiguity.
Common mistakes and how to correct them
1. Using su when you mean someone specific
Incorrect: Su amigo llamó. (unclear: whose friend?)
Better: El amigo de María llamó. or El amigo de él llamó.
2. Adding accents incorrectly
Incorrect: Tú casa es bonita. (wrong accent)
Correct: Tu casa es bonita.
3. Gender agreement error
Remember: short possessives do not change with gender. Incorrect: Mi casaa? Correct: Mi casa, Mis casas.
4. Confusing long and short forms
Beginner tip: use mi/tu/su before the noun. Only use mío/tuya when emphasizing or after the noun: Esa mochila es mía.
Short practice exercises
Fill in the blank with mi, tu, or su:
______ teléfono está sonando.
______ padres viven lejos.
______ número de reserva es 12345. (formal)
Answers:
Mi teléfono está sonando.
Tus padres viven lejos.
Su número de reserva es 12345.
Translate these simple sentences
Translate to Spanish using mi, tu, or su:
My coffee is cold.
Your (informal) friend is here.
Their house is blue.
Possible translations:
Mi café está frío.
Tu amigo está aquí.
Su casa es azul.
Useful vocabulary related to possession
Due to the topic, beginners should learn these words:
la casa — house
el carro — car
el libro — book
las llaves — keys
el teléfono — phone
la mochila — backpack
la reserva — reservation
el número — number
Short phrases to memorize
Mi nombre es…
Tu turno
Su comprobante
Mis documentos
Tus ojos
Practical tips for classroom and travel
When meeting people: Use tu with peers and people your age unless the setting calls for formality. Use titles and su for adults in formal situations: Buenas tardes, ¿cómo está usted? Su asiento está aquí.
On forms and signs: Expect de + noun or su for formal references: número de teléfono, su firma, nombre del pasajero.
When speaking fast: Watch for number agreement. Native speakers will often drop words, so context helps decide whether su means his, her, or their.
Common questions from beginners
Q: Can I say tu with someone older?
A: Generally no in formal situations. Use usted and su to be polite unless the person invites you to use tú.
Q: How do I say our?
A: Use nuestro or nuestros (long form) or nuestro/a depending on gender and number: nuestra casa, nuestros amigos. Short form equivalents like mi/tu/su do not include first person plural; learn nuestro next.
Q: Is su always ambiguous?
A: Often yes, but context or clarifying phrases remove ambiguity. Use de + name when necessary.
Conclusion
Learning mi, tu, and su gives you quick access to everyday Spanish. Focus on placing them before the noun, matching number with -s, and using context to solve ambiguity with su. Practice with real-life examples like signs, menus, and conversations to build confidence fast.
