Basic Conjunctions in Spanish

In Brief

Spanish uses y/e for “and,” o/u for “or,” pero for a contrast, sino for a correction after a negative, porque for a reason, and así que for a result. Use e instead of y before an i sound (español e inglés) and u instead of o before an o sound (siete u ocho). These sound-based changes do not alter the meaning.

Overview

A conjunction is a connecting word. It can join individual words, groups of words, or clauses (parts of a sentence that contain their own verb). Compare pan y queso (“bread and cheese”), where two nouns are joined, with Trabajo y estudio (“I work and study”), where two actions are joined.

Basic conjunctions are introduced at A1 because they let you build useful sentences from ideas you already know. Instead of saying Es tarde. No estoy cansado, you can say Es tarde, pero no estoy cansado (“It is late, but I am not tired”). The relationship between the ideas becomes immediately clear.

English and Spanish make many of the same distinctions, but they do not match perfectly. Spanish changes the forms of “and” and “or” to avoid repeated sounds. It also normally distinguishes pero (“but,” introducing a contrast) from sino (“but rather,” replacing something that has just been denied). That second distinction deserves particular attention because English uses “but” for both jobs.

How It Works

The core system

Conjunction	Usual English meaning	What it connects or expresses
y	and	addition
e	and	addition before an i sound
o	or	a choice or alternative
u	or	a choice before an o sound
pero	but	contrast or an unexpected difference
sino	but rather, but instead	correction after a negative
porque	because	reason or cause
así que	so, therefore	result or consequence

Adding information with y and e

Use y to add one item, quality, action, or idea to another:

• café y leche — coffee and milk
• fácil y útil — easy and useful
• Cocino y escucho música. — I cook and listen to music.

Use e instead when the next word begins with the vowel sound /i/. This normally includes words beginning with written i- or hi-:

• España e Italia — Spain and Italy
• madre e hija — mother and daughter
• lengua e historia — language and history

The rule follows sound rather than the letter alone. Keep y before a word whose initial i forms a different sound, as in hie-:

• agua y hielo — water and ice
• oro y hierro — gold and iron

At beginner level, a reliable shortcut is: use e before ordinary i- and hi- words, but keep y before hie-.

Offering alternatives with o and u

Use o between alternatives. The choice may be exclusive (one or the other) or may simply leave several possibilities open; context tells you which meaning is intended:

• ¿Té o café? — Tea or coffee?
• Podemos ir hoy o mañana. — We can go today or tomorrow.

Use u instead of o before a word beginning with the /o/ sound, normally written o- or ho-:

• siete u ocho personas — seven or eight people
• mujeres u hombres — women or men
• vertical u horizontal — vertical or horizontal

This rule also applies when the next item is a number pronounced with an initial o sound: 7 u 8 is read siete u ocho. Modern Spanish does not need an accent on o between digits: write 7 o 9, not 7 ó 9.

Contrasting ideas with pero

Use pero when the second idea contrasts with the first or goes against an expectation:

• La casa es pequeña, pero cómoda. — The house is small but comfortable.
• Quiero ir, pero no tengo tiempo. — I want to go, but I do not have time.

A negative first clause does not automatically require sino. If the second idea merely adds a contrast, pero is still correct:

• No es barato, pero es bueno. — It is not cheap, but it is good.

Here, “good” does not replace “cheap”; both statements can be true.

Correcting a negative with sino and sino que

Use sino when you first reject one possibility and then replace it with the correct one. The pattern is:

no + rejected information + sino + replacement

• No quiero té, sino café. — I do not want tea, but rather coffee.
• No es lunes, sino martes. — It is not Monday, but Tuesday.

Use sino que when the replacement is a full clause with a conjugated verb (a verb changed for person and tense):

• No trabaja, sino que estudia. — He does not work; rather, he studies.
• No fuimos en coche, sino que tomamos el tren. — We did not go by car; instead, we took the train.

A practical test is to ask whether the second part corrects the first. If yes, use sino or sino que. If it simply introduces a surprising contrast, use pero.

Giving a reason with porque

Porque introduces the cause or reason for something:

result or situation + porque + reason

• Estudio español porque vivo en Madrid. — I study Spanish because I live in Madrid.
• Cerramos la ventana porque hace frío. — We close the window because it is cold.

Do not confuse porque (“because”) with por qué (“why”):

• ¿Por qué estudias español? — Why do you study Spanish?
• Porque me gusta. — Because I like it.

A complete answer can begin with porque in everyday conversation. In careful writing, it normally connects the answer to an understood or stated result.

Showing a result with así que

Así que introduces what happens as a consequence. It reverses the direction used with porque:

• Hace frío, así que cierro la ventana. — It is cold, so I close the window.
• Cierro la ventana porque hace frío. — I close the window because it is cold.

The facts are similar, but the focus changes. Porque points backward to the reason; así que moves forward to the result.

Examples in Context

Spanish	English	Note
Hablo español e inglés.	I speak Spanish and English.	e before the i sound in inglés
Compramos pan y hielo.	We buy bread and ice.	y remains before hie-
Ana cocina y Pablo pone la mesa.	Ana cooks, and Pablo sets the table.	joins two clauses
¿Quieres té o café?	Do you want tea or coffee?	ordinary choice with o
Llegan siete u ocho estudiantes.	Seven or eight students are arriving.	u before ocho
Puedes llamar hoy o mañana.	You can call today or tomorrow.	two alternatives
Es tarde, pero no estoy cansado.	It is late, but I am not tired.	unexpected contrast
El examen es difícil, pero corto.	The exam is difficult but short.	two contrasting qualities
No vivo en Sevilla, sino en Cádiz.	I do not live in Seville, but in Cádiz.	replaces one place with another
No cenamos en casa, sino que fuimos a un restaurante.	We did not have dinner at home; instead, we went to a restaurant.	sino que before a full clause
Estudio porque me gusta aprender.	I study because I like learning.	gives a reason
No salimos porque llueve.	We are not going out because it is raining.	reason for not going out
Llueve, así que llevamos paraguas.	It is raining, so we are taking umbrellas.	gives a consequence
Tengo hambre, así que preparo algo de comer.	I am hungry, so I am making something to eat.	everyday result

Common Mistakes

Using y before an i sound

• Wrong: Hablo español y inglés.
• Right: Hablo español e inglés.
• Why: Y changes to e before the initial /i/ sound of inglés. The meaning remains “and.”

Changing y merely because the next word contains i

• Wrong: Necesito agua e hielo.
• Right: Necesito agua y hielo.
• Why: The change depends on the first sound. Hielo begins with a sound like English “y,” not a plain /i/ sound.

Forgetting u before an o sound

• Wrong: Son siete o ocho.
• Right: Son siete u ocho.
• Why: O becomes u before the initial /o/ sound of ocho.

Using pero for a correction

• Wrong: No quiero agua, pero café.
• Right: No quiero agua, sino café.
• Why: Coffee replaces the rejected choice, water. Use sino after a negative correction; reserve pero for contrast.

Omitting que before a replacement clause

• Wrong: No descansa, sino trabaja.
• Right: No descansa, sino que trabaja.
• Why: When the correction contains a conjugated verb such as trabaja, use sino que.

Confusing porque and por qué

• Wrong: ¿Porque estás aquí?
• Right: ¿Por qué estás aquí? — “Why are you here?”
• Why: Por qué asks for a reason; porque introduces the reason in an answer: Porque trabajo aquí (“Because I work here”).

Usage Notes

Commas and pauses

Spanish normally places a comma before pero when it joins two clauses: Quiero salir, pero llueve. A comma also commonly separates a result introduced by así que: Es tarde, así que me voy. Sino is usually preceded by a comma when it corrects a negative statement: No es azul, sino verde.

Do not automatically put a comma before every y or o. Simple lists and paired actions normally have none: pan, queso y fruta; trabajo y estudio. Longer sentences may use a comma for structure or clarity, but that is a writing issue rather than part of the basic conjunction itself.

Repeating conjunctions

In a normal list, Spanish—like English—usually puts y only before the final item: Compré pan, leche y fruta. Repetition can add emphasis or imitate the flow of speech: Habla y habla y habla (“He/She talks and talks and talks”). This is expressive, not the neutral list pattern.

Repeated o can make each alternative explicit: O vienes conmigo o te quedas aquí (“Either you come with me or you stay here”). At A1, ordinary single o is enough for most choices.

Meaning can depend on what the negative covers

Compare:

• No salimos porque llueve. — We are not going out because it is raining.
• No salimos porque llueve, sino porque estamos cansados. — We are not going out because it is raining, but because we are tired.

The second sentence rejects one proposed reason and replaces it with another. In speech, stress and context help; in writing, sino makes the correction clear.

Beyond the Basics

You do not need to master all of these details at A1, but they explain forms you will meet later.

Y/e and o/u still follow pronunciation in less familiar words. The written first letter is only a clue. Foreign names and technical terms may keep a pronunciation that determines which conjunction sounds natural. When unsure, listen to how the next word is actually pronounced.

Pero and sino belong to a larger contrast system. More advanced Spanish uses connectors such as sin embargo (“however”), no obstante (“nevertheless”), and en cambio (“by contrast”). These can organize longer arguments, but they do not replace the basic grammatical pattern no X, sino Y in every context.

Porque has several relatives. Besides interrogative por qué, advanced writing uses the noun el porqué (“the reason”) and the less common relative form por que in specific structures. For now, remember the high-frequency pair: question ¿por qué?, answer porque.

Así que is common and neutral in conversation. Other result connectors include por eso (“that is why”), por lo tanto (“therefore”), and de modo que (“so that/as a result”). They differ in sentence structure and register. Así que remains a natural choice for everyday consequences.

Conjunctions can eventually introduce grammar beyond simple statements, including the subjunctive (a verb form often used for uncertainty, wishes, or non-factual situations). For example, advanced structures with para que or a menos que require rules not covered here. The conjunctions in this article normally let beginners work with familiar indicative statements.

Practice Tips

1. Build paired sentences. Take two short facts and connect them in different ways: Tengo sueño porque es tarde; Es tarde, así que tengo sueño. This trains the reason–result direction.
2. Practice corrections aloud. Point to nearby objects or invent simple facts using No es X, sino Y. Then add full clauses with No..., sino que... so the extra que becomes automatic.
3. Listen for the sound changes. Collect examples of e before i/hi and u before o/ho. Say each phrase aloud; these forms exist to make pronunciation smoother, so hearing the pattern is more useful than memorizing a spelling-only rule.

Related Concepts

• Later development: Complex Sentence Structures — combines clauses in more sophisticated ways and explores how their relationships affect sentence structure.
• Later development: Discourse Connectors — expands basic links such as contrast, cause, and result into advanced spoken and written organization.