Using Indefinite Articles in Spanish: Examples and Exercises

Both definite and indefinite articles in Spanish are very useful to talk about different topics in the language. Using articles correctly does make a big difference in a real conversation. Spanish indefinite articles are called LOS ARTICULOS INDEFINIDOS and they are the equivalent to AN, A and SOME in English. This lesson will show you several examples of sentences using indefinite articles plus exercises to practice this topic. Let’s start…

Using indefinite articles in Spanish in sentences examples and exercises
Los artículos indefinidos en español

How to make sentences using indefinite articles in Spanish

LOS ARTÍCULOS INDEFINIDOS or indefinite articles in Spanish are used to designate a non-unique object from a group. To put it differently,  the definite article “EL” in “El perro azul” tells that we are talking about a specific “blue dog”, perhaps the only blue one in a group of dogs. On the other hand, if we said “Un perro azul” using one of the indefinite articles in Spanish, then it could be any “blue dog” from any place or group, not one in specific. As you can imagine, these articles are related to the number (singular/plural) and gender (masculine/feminine) of nouns.

Let’s discuss another example. In the sentence “La cocina está sucia” (The kitchen is dirty), LA COCINA refers to an object previously known by both speakers. However, if we said “Una cocina está sucia”, then we would not clearly state which of all kitchens is dirty. Notice that we will use the article “UN” for masculine nouns like “PERRO”, and “UNA” for feminine nouns like “COCINA”. Here are some examples of sentences using indefinite articles in Spanish. Notice how they agree with the noun’s gender and number.

Spanish indefinite articles examples

UNA (feminine/singular) – Tengo una computadora.
Translation: I have a computer
UNAS/ALGUNAS(feminine/plural) – Hay unas pastillas sobre la mesa
Translation: There are some pills on the table
UN (singular/masculine) – ¿Puedes prestarme un lápiz?
Translation: Can you lend me a pencil?
Unos/Algunos (masculine/plural) – Estos son algunos/unos de los libros que me prestaste.
Translation: These are some of the books you lent me

Language Note: Sometimes, it is better to use the word ALGUNOS instead of the indefinite article UNOS, just like in the last example.

When to use the in Spanish indefinite articles UN, UNA, UNOS, UNAS

There are certain things to consider when using these articles to refer to objects in real situations. Pay attention the these three points and then practice with some exercises about Spanish indefinite articles with an interactive quiz.

  1. First, we do not need an indefinite article in negative sentences, e.g. to say “I do not have a computer”, you should say “No tengo computadora” and not “No tengo una computadora”.
  2. Second, the article UNA changes to UN when used before a feminine noun that begins with the sound A, no matter if the word begins with H. An example of this exception would be “Un arma” (a weapon), “Un hacha” (an ax), “Un águila” (an eagle). Some sentences using these nouns are: “Hay un águila en el árbol” (there is an eagle on the tree) and “¿Me puedes prestar un hacha?” (Can you lend me an ax?). 
  3. Third, we must omit indefinite articles in Spanish before nationalities, professions, religions and political affiliations. To illustrate this, saying “Soy ingeniero” is totally correct, but saying “Soy un ingeniero” is not.

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