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

Examples
¡Detengan la música! Es demasiado tarde.
Stop the music! It's too late.
Es crucial que detengan el coche antes de la curva.
It is crucial that they stop the car before the curve.
No permitan que estas dificultades los detengan.
Don't let these difficulties hold you (formal plural) back.
Formal Plural Command
"Detengan" is the formal way (using 'ustedes') to tell a group of people to stop doing something. It comes directly from the special verb form used for wishes and commands.
Subjunctive Use
When used as 'they stop,' it appears after phrases expressing desire, necessity, doubt, or emotion, like 'Quiero que...' (I want that...) or 'Es necesario que...' (It is necessary that...).
Confusing Formal Command
Mistake: “Using *detienen* (the indicative form) for a command: ¡Detienen el carro!”
Correction: Use the command form: ¡Detengan el carro! (The verb form changes when you give an order or instruction).
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