How to Say "showed up" in Spanish
The Spanish word for “showed up” is “apareció” — A1 level. This is a very common word in everyday Spanish.

Examples
De repente, el sol apareció detrás de las nubes.
Suddenly, the sun appeared behind the clouds.
Mi hermano apareció en la fiesta sin avisar a nadie.
My brother showed up at the party without telling anyone.
La carta perdida apareció justo cuando íbamos a llamar a la oficina de correos.
The lost letter turned up just when we were about to call the post office.
Past Action Completed
'Apareció' is the simple past tense (preterite) and is used for an action that started and finished at a specific point in the past, like 'The dog appeared at 5 PM.'
Subject Change
This form is used when the subject is a single person (he, she, or formal you/usted) or a single thing (it).
Preterite vs. Imperfect
Mistake: “Usando 'aparecía' para un evento único: 'El fantasma aparecía de repente.'”
Correction: Use 'apareció' for a single event: 'El fantasma apareció de repente.' (The ghost appeared suddenly.) 'Aparecía' would mean 'it used to appear' or 'it was appearing.'
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