Ayer tuve una reunión importante.
English: Yesterday I had an important meeting.
The 'pretérito indefinido' is a past tense in Spanish used to talk about actions that were completed in the past. Some common verbs have irregular forms in this tense.
Use this tense to talk about actions that happened and finished in the past, especially when you mention when they happened (like yesterday, last week, in 2010).
Ayer tuve una reunión importante.
English: Yesterday I had an important meeting.
El año pasado fuimos a España.
English: Last year we went to Spain.
Ella hizo la tarea anoche.
English: She did the homework last night.
Nosotros estuvimos en casa todo el día.
English: We were at home all day.
¿Qué dijiste?
English: What did you say?