Spanish Possessive Adjectives: How to Use Mi, Tu, Su, Nuestro

Learning Spanish possessive adjectives can feel confusing at first, especially when you're trying to figure out whether to use mi, tu, or su in a sentence. Here's the thing though: once you understand how these words work and how they agree with the nouns they modify, everything clicks into place. Spanish possessive adjectives follow specific rules about gender and number that English doesn't really have, so you'll need to wrap your head around some new concepts. This guide breaks down exactly how to use mi, tu, su, nuestro, and all their forms with plenty of examples to make it stick.

What are possessive adjectives in Spanish

A possessive adjective is a word that shows ownership or relationship between the possessor and what they possess. In Spanish, these words appear directly before the noun they modify, just like in English when you say "my book" or "your car." The key difference is that Spanish possessive adjectives must match the gender and number of the thing being possessed, not the person who possesses it.

When you say "mi libro" (my book), the word mi doesn't change based on whether you're male or female. It stays the same because it's a singular noun. But when you talk about multiple books, you'd say "mis libros" because the noun is now plural. This agreement system is what trips up most English speakers when they start to learn Spanish.

The Spanish language has two main types of possessive adjectives: short-form (unstressed) and long-form (stressed). The short-form versions are what you'll use 95% of the time in everyday conversation. These include mi, tu, su, nuestro, vuestro, and their variations.

The complete chart of Spanish possessive adjectives

Here's a breakdown of all the short-form possessive adjectives you need to know:

For "my": mi (singular) and mis (plural) For "your" (informal): tu (singular) and tus (plural) For "his/her/your formal/their": su (singular) and sus (plural) For "our": nuestro/nuestra (singular masculine/feminine) and nuestros/nuestras (plural masculine/feminine) For "your" (informal plural in Spain): vuestro/vuestra (singular masculine/feminine) and vuestros/vuestras (plural masculine/feminine)

The possessive adjective forms change based on what you're describing, which is pretty different from English. You don't think about whether the book is masculine or feminine in English, but in Spanish, that matters for some possessive adjectives.

Understanding singular and plural forms

Most Spanish possessive adjectives have both singular and plural versions. When the noun you're describing is singular, you use the singular form. When it's plural, you switch to the plural form.

With mi, the singular form describes one item: "mi casa" (my house). The plural form mis describes multiple items: "mis casas" (my houses). Same pattern applies to tu and tus: "tu amigo" (your friend) versus "tus amigos" (your friends).

The word su works the same way for singular and plural agreement: "su coche" (his/her/your/their car) becomes "sus coches" (his/her/your/their cars). This is where things get interesting because su can mean so many different things depending on context.

For nuestro and vuestro, you've got four different forms to work with because these possessive adjectives also change for gender. I'll explain that in the next section, but the singular versus plural distinction still applies to all forms.

Gender agreement with masculine and feminine nouns

Here's where Spanish possessive adjectives get more complex than English. While mi, tu, and su stay the same regardless of whether the noun is masculine or feminine, nuestro and vuestro actually change their endings.

If you're talking about "our book" and libro is masculine, you say "nuestro libro." But if you're talking about "our house" and casa is feminine, you say "nuestra casa." The possessive adjective matches the gender of the thing being possessed.

This pattern continues in plural forms too. "Nuestros libros" (our books, masculine) versus "nuestras casas" (our houses, feminine). Same deal with vuestro: "vuestro perro" (your dog, masculine) and "vuestra gata" (your cat, feminine).

The masculine and feminine agreement only applies to nuestro and vuestro. You don't change mi to ma or tu to ta based on gender. That would make things way too complicated, and Spanish already has enough complexity with gender agreement in other areas.

How to use possessive adjectives in sentences

Possessive adjectives in Spanish always go directly before the noun they modify. You can't separate them with other words like you sometimes can in English.

"Mi hermano vive en Madrid" (My brother lives in Madrid). The possessive adjective mi sits right before hermano with no articles or other words in between. You wouldn't say "mi el hermano" or "el mi hermano" because Spanish doesn't use articles with possessive adjectives in this short form.

Here are more examples showing natural usage:

"Tu madre cocina muy bien" (Your mother cooks very well) "Sus hijos estudian en la universidad" (His/her/your/their children study at the university) "Nuestras amigas llegan mañana" (Our friends arrive tomorrow) "Mis padres trabajan juntos" (My parents work together)

Notice how the possessive adjective changes to match the noun in number, and in the case of nuestras, it also matches in gender because amigas is feminine plural.

The tricky case of su and sus

The word su causes more confusion than any other possessive adjective because it can mean "his," "her," "your" (formal), "its," or "their." The pronoun it refers to depends entirely on context.

"Su casa es grande" could mean:

In conversation, context usually makes it clear. If you've been talking about María, then "su casa" obviously means "her house." But in writing or when clarity matters, Spanish speakers often use a prepositional phrase instead: "la casa de él" (his house), "la casa de ella" (her house), "la casa de usted" (your house), or "la casa de ellos" (their house).

The same ambiguity applies to sus in plural: "sus libros" could refer to his books, her books, your books, or their books. When you need to be specific, swap it out for the clearer prepositional construction.

What are the 12 possessive adjectives in Spanish

When people ask about the 12 possessive adjectives, they're counting all the short-form variations. Here's the complete list:

Some lists include 16 if you count vuestros and vuestras separately, plus the long-form possessive adjectives. But these 12 cover the essential short-form possessives you'll encounter in everyday Spanish.

Long-form possessive adjectives

Spanish also has stressed or long-form possessive adjectives that come after the noun instead of before it. These forms add emphasis or appear in specific grammatical constructions.

The long-form possessives are: mío/mía/míos/mías (mine), tuyo/tuya/tuyos/tuyas (yours), suyo/suya/suyos/suyas (his/hers/yours formal/theirs), nuestro/nuestra/nuestros/nuestras (ours), and vuestro/vuestra/vuestros/vuestras (yours plural in Spain).

You use these after the noun for emphasis: "un amigo mío" (a friend of mine) instead of "mi amigo" (my friend). The long-form version emphasizes the possessive relationship or sounds more formal.

These long-form possessives also appear after the verb ser: "Este libro es mío" (This book is mine). You can't use the short form here. You'd never say "Este libro es mi."

Possessive pronouns versus possessive adjectives

A possessive pronoun replaces the noun entirely, while a possessive adjective modifies a noun. This distinction matters when you're constructing sentences.

"Mi coche es rojo" (My car is red) uses the possessive adjective mi before the noun coche. But "El mío es rojo" (Mine is red) uses the possessive pronoun mío to replace "mi coche" entirely.

The possessive pronoun forms in Spanish are: el mío/la mía/los míos/las mías, el tuyo/la tuya/los tuyos/las tuyas, el suyo/la suya/los suyos/las suyas, el nuestro/la nuestra/los nuestros/las nuestras, and el vuestro/la vuestra/los vuestros/las vuestras.

Notice that possessive pronouns include the definite article (el, la, los, las) and must match the gender and number of the noun they're replacing. "Tu casa es grande, pero la mía es pequeña" (Your house is big, but mine is small). The possessive pronoun la mía is feminine singular because it replaces casa, which is feminine singular.

Common mistakes to avoid

Beginners often try to use articles with short-form possessive adjectives. You don't say "la mi casa" or "el tu carro." Just drop the article: "mi casa," "tu carro." The possessive adjective replaces the article.

Another frequent mistake is forgetting to make the possessive adjective plural when the noun is plural. "My friends" is "mis amigos," not "mi amigos." The plural marker on mis matches the plural noun.

Gender agreement trips people up with nuestro and vuestro. Remember that these change based on the noun's gender, not the speaker's gender. A woman talking about "our car" still says "nuestro coche" if coche is masculine in Spanish.

Overusing su when you need clarity causes confusion too. If you're writing and it's not obvious from context whose possession you're describing, use the prepositional phrase construction instead: "el libro de María" rather than "su libro."

Regional differences with vuestro

In Latin America, vuestro and its forms basically don't exist in everyday speech. Latin American Spanish uses ustedes for both formal and informal plural "you," which means the possessive becomes su/sus for all plural "your" situations.

In Spain, vuestro/vuestra/vuestros/vuestras are alive and well for informal plural situations. Spanish speakers in Madrid would say "vuestro coche" when talking to a group of friends about "your car." But in Mexico City, that same sentence would be "su coche."

This regional variation doesn't affect mi, tu, or nuestro. Those work the same across all Spanish-speaking regions. If you're learning Spanish primarily for Latin America, you can basically ignore vuestro forms and focus on the others.

Practice examples with translations

Here are 20 examples showing possessive adjectives in natural sentences:

Tips for remembering the rules

The easiest possessive adjectives to remember are mi/mis and tu/tus because they only change for plural. Just ask yourself: am I talking about one thing or multiple things? That determines whether you add the s.

For nuestro and vuestro, think about both the number and gender of what you're describing. Create a mental checklist: Is it one or many? Is the noun masculine or feminine? Then pick the right form.

With su and sus, start by checking if the noun is singular or plural. Then, if context doesn't make ownership clear, consider switching to a prepositional phrase for clarity.

Practice by describing things around you. Look at your desk and say "mi computadora, mis libros, mi taza." Then describe someone else's stuff: "su teléfono, sus papeles." The more you use these in real contexts, the faster they'll become automatic.

Using possessive adjectives with family members

Spanish speakers use possessive adjectives constantly when talking about family. "Mi madre" (my mother), "tu padre" (your father), "sus hijos" (his/her/your/their children), "nuestros abuelos" (our grandparents).

You don't need articles with family members when using possessive adjectives. Just say "mi hermana," not "la mi hermana." The possessive adjective already specifies which sister you mean.

Plural family terms follow the same rules: "mis primos" (my cousins), "tus tías" (your aunts), "nuestras sobrinas" (our nieces). The possessive adjective matches the plural noun.

When talking about family relationships, context usually makes su clear. If you're having a conversation about Pedro, "su esposa" obviously means "his wife." But in formal writing, you might specify "la esposa de Pedro" to avoid any ambiguity.

Why possessive adjectives matter for fluency

You use possessive adjectives in almost every conversation. Talking about your day involves mentioning "mi trabajo" (my work), "mi jefe" (my boss), "mis compañeros" (my coworkers). Making plans means discussing "tu horario" (your schedule) or "nuestro restaurante favorito" (our favorite restaurant).

Getting these wrong doesn't usually destroy comprehension, but it marks you as a beginner. Native speakers automatically match gender and number without thinking about it. When you master this skill, your Spanish sounds way more natural.

The good news is that possessive adjectives follow predictable patterns. Unlike irregular verbs that have random conjugations, these adjectives stick to their rules. Learn the system once, practice it consistently, and you'll have it down.

Anyway, if you want to practice Spanish possessive adjectives in real contexts, Migaku's browser extension lets you read articles and watch videos with instant word lookups. You can see how native content uses mi, tu, and su naturally in thousands of sentences. There's a 10-day free trial if you want to check it out.