How to Say "lose" in Spanish
The most common Spanish word for “lose” is “pierda” — use 'pierda' when expressing a wish, hope, or a formal command (usted form) that someone or oneself loses something..
pierda
/pyehr-dah//ˈpjeɾða/

Examples
Espero que no pierda mi teléfono otra vez.
I hope I don't lose my phone again.
Dígale que no pierda el tiempo con esas cosas.
Tell him not to waste time with those things.
Aunque el equipo sea fuerte, existe la posibilidad de que pierda.
Even if the team is strong, there is a possibility that it might lose.
Subjunctive Mood
This form ('pierda') is used when you express wishes, uncertainty, emotions, or opinions about the actions of others (or yourself). It signals that the action hasn't happened yet or is not a guaranteed fact.
Stem Change
The verb perder is irregular. The 'e' in the middle changes to 'ie' in most present tense forms, including 'pierda', but not in the 'we' (nosotros) or 'you all' (vosotros) forms (e.g., perdamos).
Using the wrong mood
Mistake: “No creo que él pierde.”
Correction: No creo que él pierda. (When expressing doubt or disbelief, Spanish requires the special verb form, 'pierda', not the simple fact form, 'pierde'.)
pierde
pee-AIR-deh/'pjeɾ.ðe/

Examples
Mi perro siempre se escapa y pierde su collar.
My dog always escapes and loses his collar.
Mi perro siempre se escapa y **pierde** su collar.
My dog always escapes and loses his collar.
Si no practica, el equipo **pierde** todos los partidos.
If he doesn't practice, the team loses every game.
¡Si sabes la respuesta, no **pierde** tiempo!
If you know the answer, don't lose time! (Informal command)
The 'Shoe Verb' Change
The verb 'perder' is irregular because the 'e' changes to 'ie' in most forms, except for the 'nosotros' and 'vosotros' forms. This is called a stem change.
Forgetting the Stem Change
Mistake: “Él perde su teléfono.”
Correction: Él pierde su teléfono. Remember that 'e' turns into 'ie' when stressed.
Indicative vs. Subjunctive Mood
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