Pasar vs. ocurrir vs. suceder vs. acontecer
In Spanish, the verbs pasar, ocurrir, suceder, and acontecer all translate to to happen or to occur. While they are often interchangeable, they carry subtle differences in formality, commonality, and context, making the choice of word important for conveying the right tone.
Pasar
A1This is the most common and versatile verb for to happen. It is the default, neutral choice used in all contexts, from casual, everyday conversations to more formal situations. If you are unsure which word to use, pasar is almost always a safe bet.
¿Qué te pasa? Pareces preocupado.
(What's wrong with you? You seem worried.)
Anoche pasaron cosas muy extrañas en el vecindario.
(Very strange things happened in the neighborhood last night.)
No te preocupes, no pasa nada.
(Don't worry, nothing's wrong / nothing is happening.)
Pase lo que pase, siempre seremos amigos.
(Whatever happens, we will always be friends.)
Ocurrir
B1This verb is slightly more formal than pasar and often implies that an event happened unexpectedly or by chance. It is frequently used in news reports and formal writing. A unique and very common use is in the pronominal form ocurrirse a alguien, which means to occur to someone or for an idea to come to mind.
El accidente ocurrió a las tres de la tarde.
(The accident occurred at three in the afternoon.)
Se me ocurrió una idea brillante para el proyecto.
(A brilliant idea for the project occurred to me.)
Los hechos ocurrieron sin que nadie se diera cuenta.
(The events occurred without anyone noticing.)
¿Sabes si ocurrió algo interesante en la reunión?
(Do you know if anything interesting happened at the meeting?)
Suceder
B2Similar in formality to ocurrir, suceder is common in written Spanish, news, and literature. It often refers to an event, or a series of events, unfolding as part of a process or as a consequence of something else. Note that suceder also means to succeed in the sense of to follow or to take someone's place.
El noticiero informó todo lo que sucedió durante la manifestación.
(The newscast reported everything that happened during the demonstration.)
Después de la discusión, no imaginábamos lo que iba a suceder.
(After the argument, we couldn't imagine what was going to happen.)
Es importante entender por qué suceden estos fenómenos naturales.
(It is important to understand why these natural phenomena happen.)
El príncipe va a suceder al rey en el trono.
(The prince is going to succeed the king on the throne.)
Acontecer
C1This is the most formal, literary, and least common of the four verbs. It is almost exclusively used in historical narratives, literature, or formal journalism to refer to significant, important, or momentous events. Using it in everyday conversation would sound unnatural and overly dramatic. Its noun form, el acontecimiento (the event), is more common.
El libro narra los hechos que acontecieron durante la guerra.
(The book narrates the events that happened during the war.)
La caída del muro fue un acontecimiento que cambió el mundo.
(The fall of the wall was an event that changed the world.)
Pocos predijeron el gran cambio social que estaba por acontecer.
(Few predicted the great social change that was about to take place.)
El eclipse es un fenómeno astronómico que acontece con poca frecuencia.
(The eclipse is an astronomical phenomenon that happens infrequently.)
Summary
In short, the main difference is formality and context. Use pasar for any everyday situation (¿Qué pasó?). Use ocurrir and suceder for more formal or written contexts, like news or reports. Ocurrir often implies something sudden or unexpected and is used for ideas (se me ocurrió). Suceder often implies a sequence of events. Reserve the very formal acontecer for describing significant historical or literary events.