How to Form Spanish Relative Clauses with “Que” and “Cual”

Introduction

Mastering relative clauses is essential for anyone learning Spanish. These grammatical structures allow you to connect ideas, provide additional information, and speak more naturally. Two of the most important relative pronouns you’ll encounter are que and cual (along with its plural form, cuales). While both can translate to English words like which, that, or who, they follow different rules and appear in distinct contexts. Understanding when to use each one will dramatically improve your Spanish fluency and help you sound more like a native speaker.

Understanding the Basics of Spanish Relative Clauses

A relative clause is a type of subordinate clause that provides additional information about a noun in the main sentence. In English, you might say, The book that I bought is interesting. The phrase that I bought is the relative clause, giving us more details about which book we’re discussing.

Spanish works similarly, but with some important differences. The relative pronoun you choose depends on several factors: whether you’re using a preposition, the formality of your speech, and sometimes regional preferences. Let’s break down how que and cual function in Spanish relative clauses.

The Versatile Relative Pronoun: Que

The word que is by far the most common relative pronoun in Spanish. It’s versatile, appearing in both formal and informal contexts, and it can refer to people, things, or ideas. Think of que as your go-to relative pronoun in most situations.

Using Que to Refer to People and Things

When you want to add information about a person or thing without using a preposition, que is almost always your choice. Here are some examples:

El chico que conocí ayer es muy simpático.
(The boy that I met yesterday is very nice.)

La película que vimos anoche fue aburrida.
(The movie that we saw last night was boring.)

Los estudiantes que estudian mucho sacan buenas notas.
(The students who study a lot get good grades.)

Notice how que works for both people (the boy, the students) and things (the movie). This flexibility makes it incredibly useful. Unlike English, where we sometimes distinguish between who for people and that or which for things, Spanish uses que for everything in these direct relative clauses.

Que After Short Prepositions

When you use short, common prepositions like a, de, con, or en, you’ll still typically use que. These combinations are extremely common in everyday Spanish:

La casa en que vivo es pequeña.
(The house in which I live is small.)

El tema de que hablamos es importante.
(The topic that we’re talking about is important.)

La persona con que trabajo es amable.
(The person with whom I work is kind.)

However, there’s an important exception: when referring to people after the preposition a, many Spanish speakers prefer to use quien or quienes instead. For example, you might hear La chica a quien llamé rather than La chica a que llamé, though both are grammatically acceptable.

When to Use El Que, La Que, Los Que, Las Que

Sometimes que appears with a definite article: el que, la que, los que, or las que. These forms have two main uses that are important to understand.

After Longer Prepositions

When you use longer or compound prepositions (like detrás de, delante de, cerca de, junto a, encima de), you must use the article form. The article agrees in gender and number with the noun it refers to:

El edificio detrás del cual está mi coche es antiguo.
(The building behind which my car is parked is old.)

Las razones por las que renuncié son personales.
(The reasons for which I resigned are personal.)

La mesa encima de la que puse las llaves está en la cocina.
(The table on top of which I put the keys is in the kitchen.)

Meaning The One Who or Those Who

These forms can also stand alone to mean the one who, the ones who, or he/she who. This usage is extremely common:

El que llegue primero gana el premio.
(The one who arrives first wins the prize.)

Los que estudian aprueban el examen.
(Those who study pass the exam.)

La que canta es mi hermana.
(The one who is singing is my sister.)

Introducing El Cual, La Cual, Los Cuales, Las Cuales

Now we come to el cual and its related forms. These relative pronouns are more formal than que and appear primarily in written Spanish, legal documents, academic texts, and formal speech. While you’ll encounter them less frequently in everyday conversation, understanding them is crucial for reading sophisticated Spanish texts and for formal communication.

The Four Forms of Cual

The relative pronoun cual always appears with a definite article, and it must agree in gender and number with the noun it refers to:

el cual (masculine singular)
la cual (feminine singular)
los cuales (masculine plural)
las cuales (feminine plural)

When to Use Cual Instead of Que

After Prepositions for Clarity

One of the main reasons to use cual is to avoid ambiguity. When a preposition appears far from its antecedent (the noun being referred to), or when there might be confusion about which noun the relative clause modifies, cual provides clarity through its gender and number agreement:

Conocí al hermano de María, el cual es médico.
(I met Maria’s brother, who is a doctor.)

Here, using el cual makes it clear that the brother (not Maria) is the doctor. If we used que, the sentence would be ambiguous in some contexts.

Vi la casa de tu amigo, la cual es muy grande.
(I saw your friend’s house, which is very large.)

The use of la cual (feminine) clarifies that we’re talking about the house, not the friend.

In Formal or Written Contexts

In academic writing, journalism, and formal speeches, cual is often preferred, especially after prepositions. It adds a level of sophistication and precision to your Spanish:

El tratado, según el cual se establecieron nuevas normas, fue firmado ayer.
(The treaty, according to which new regulations were established, was signed yesterday.)

Los documentos sin los cuales no podemos continuar están perdidos.
(The documents without which we cannot continue are lost.)

After Longer Prepositions

Just like el que, la que, etc., the forms of cual are commonly used after longer or compound prepositions. In these cases, both options are correct, though cual might sound slightly more formal:

La montaña encima de la cual construyeron el observatorio es la más alta de la región.
(The mountain on top of which they built the observatory is the highest in the region.)

El motivo por el cual te llamé era urgente.
(The reason for which I called you was urgent.)

Lo Que and Lo Cual: Referring to Ideas or Situations

Both lo que and lo cual are neuter forms that refer to entire ideas, situations, or previously stated information rather than specific nouns. Understanding these forms is essential for expressing complex thoughts in Spanish.

Using Lo Que

Lo que is extremely common in spoken and written Spanish. It can mean what, that which, or the thing that:

Lo que me dijiste me sorprendió.
(What you told me surprised me.)

No entiendo lo que quieres decir.
(I don’t understand what you mean.)

Hice lo que pude.
(I did what I could.)

Using Lo Cual

Lo cual refers back to an entire clause or idea that has just been mentioned. It’s more formal than lo que and typically follows a comma in writing:

Llegó tarde a la reunión, lo cual molestó al jefe.
(He arrived late to the meeting, which annoyed the boss.)

No estudió para el examen, lo cual explica sus malas notas.
(She didn’t study for the exam, which explains her bad grades.)

El proyecto se completó a tiempo, lo cual nos sorprendió a todos.
(The project was completed on time, which surprised us all.)

Notice how lo cual refers to the entire situation described in the first part of the sentence, not just one specific noun.

Common Mistakes and How to Avoid Them

Mistake 1: Using Que After All Prepositions

While que works after short prepositions, you need the article forms (el que or el cual) after longer ones. Don’t say La mesa encima de que puse el libro. Instead, say La mesa encima de la que puse el libro.

Mistake 2: Forgetting Agreement with Cual

Remember that cual forms must agree in gender and number. If you’re referring to las chicas (feminine plural), you must use las cuales, not el cual or los cuales.

Mistake 3: Overusing Cual in Spoken Spanish

While cual is correct in many situations, overusing it in casual conversation can make you sound overly formal or unnatural. In everyday speech, Spanish speakers strongly prefer que and el que forms. Save cual for writing or formal contexts.

Mistake 4: Confusing Lo Que with El Que

Use lo que when referring to abstract ideas or situations, not specific nouns. Use el que (with appropriate gender/number) when referring to specific people or things.

Regional Variations and Preferences

Spanish is spoken across many countries, and there are some regional differences in how relative pronouns are used. In Spain, you might hear cual forms more frequently in educated speech than you would in Latin America, where speakers tend to prefer que and el que forms even in somewhat formal contexts.

Some Latin American varieties show a strong preference for donde instead of en que or en el cual when referring to places. For example, La ciudad donde nací might be preferred over La ciudad en la que nací, though both are correct.

Practical Tips for Learning Relative Clauses

Start with Que

As a learner, master que first. It’s by far the most common relative pronoun and will serve you well in the vast majority of situations. Once you’re comfortable with que, gradually incorporate the other forms.

Read Widely

Exposure to different types of Spanish texts will help you internalize when to use each form. News articles, novels, and formal essays will give you examples of cual in context, while blogs, social media, and dialogue in books will show you how que dominates everyday language.

Practice with Longer Sentences

Challenge yourself to combine simple sentences using relative clauses. Take Vi una película and La película era muy triste and combine them: Vi una película que era muy triste. This exercise will make relative pronouns feel more natural.

Pay Attention to Prepositions

Make a mental note whenever you see a relative pronoun following a preposition. Over time, you’ll develop an intuition for which combinations sound natural and which require the article forms.

Advanced Uses and Nuances

Omitting the Relative Pronoun

Unlike English, where we can sometimes omit the relative pronoun (The book I bought vs. The book that I bought), Spanish almost always requires the relative pronoun to be stated. You cannot say El libro compré; you must say El libro que compré.

Relative Clauses with the Subjunctive

When a relative clause describes something uncertain, hypothetical, or not yet known to exist, Spanish uses the subjunctive mood. While this is a separate grammar topic, it’s worth noting that your choice between que and cual doesn’t change:

Busco un libro que explique este tema.
(I’m looking for a book that explains this topic.)

The verb is in subjunctive because the speaker doesn’t know if such a book exists, but the relative pronoun is still que.

Cuyo: The Possessive Relative

While not part of the que/cual system, it’s worth mentioning cuyo (whose), which shows possession in relative clauses. It agrees with the thing possessed, not the possessor:

El autor cuyo libro leímos es famoso.
(The author whose book we read is famous.)

This is more formal and often replaced with constructions using que in everyday speech.

Practice Exercises to Reinforce Learning

To truly master these relative pronouns, regular practice is essential. Try translating complex English sentences into Spanish, paying special attention to relative clauses. Record yourself speaking and listen for whether you’re using the pronouns naturally. Better yet, find a language exchange partner or tutor who can give you feedback on your usage.

When reading in Spanish, pause whenever you encounter a relative pronoun. Ask yourself: Why did the writer choose que here? Could cual have been used? What would change if it were? This active analysis will deepen your understanding far more than passive reading.

Write short paragraphs describing people, places, and situations in your life, making a conscious effort to include relative clauses. Challenge yourself to use both common constructions (with que) and more formal ones (with cual) so you develop flexibility in your Spanish expression.

Conclusion

Understanding the difference between que and cual in Spanish relative clauses is a significant milestone in your language learning journey. While que will be your workhorse for everyday communication, knowing when and how to use cual and its various forms will elevate your Spanish to more sophisticated levels. Remember that que is versatile and informal, perfect for most situations, while cual adds precision and formality when needed. With consistent practice and exposure to authentic Spanish, these structures will become second nature, allowing you to express complex ideas with confidence and clarity.