How to Say "they decided" in Spanish
The Spanish word for “they decided” is “decidieron” — A2 level. This is a very common word in everyday Spanish.

Examples
Ellos decidieron ir al cine después de cenar.
They decided to go to the movies after dinner.
Mis padres decidieron vender el coche viejo.
My parents decided to sell the old car.
Ustedes decidieron el menú de la boda, ¿verdad?
You all decided on the wedding menu, right?
Past Action Complete
Use 'decidieron' when a group of people finished making a choice at a specific moment in the past.
Followed by the Base Verb
When they decide 'to do' something, just put the next verb in its original -ar, -er, or -ir form (e.g., 'decidieron salir').
Confusing Past and Present
Mistake: “Using 'deciden' to talk about yesterday.”
Correction: Use 'decidieron' for the past and 'deciden' for the present.
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