How to Say "should decide" in Spanish
The Spanish word for “should decide” is “decida” — B1 level. This is a very common word in everyday Spanish.

Examples
Espero que ella decida pronto qué hacer.
I hope she decides soon what to do.
No creo que él decida venir a la fiesta.
I don't think he will decide to come to the party.
Dile que decida si quiere ir o no.
Tell him to decide whether he wants to go or not.
The Subjunctive Trigger
The form 'decida' is part of a special verb system used after certain phrases expressing wishes, emotions, doubt, or lack of certainty (like 'Espero que...' or 'No creo que...').
Formal Commands
'Decida' is also the polite, formal way to tell one person to decide: 'Usted, decida ahora' (You, decide now).
Using the wrong mood with doubt
Mistake: “No pienso que ella decide.”
Correction: No pienso que ella decida. (When you express doubt or denial, the second verb usually needs this special form.)
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