How to Say "they fail" in Spanish
The Spanish word for “they fail” is “pierden” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
verbA1
to achieve a goal

Examples
Si no entrenan, siempre pierden los partidos.
If they don't train, they always lose the games.
Ustedes pierden la calma muy fácilmente.
You all lose your temper very easily.
The 'Boot' Verb Rule
The verb 'perder' is stem-changing: the 'e' changes to 'ie' in most forms of the present tense (like 'pierden'), but NOT in the 'nosotros' or 'vosotros' forms ('perdemos', 'perdéis'). Think of it as the change only happening inside the 'boot' shape of the conjugation chart.
Forgetting the Stem Change
Mistake: “Ellos 'perden' el partido.”
Correction: Ellos 'pierden' el partido. Remember to change the 'e' to 'ie' for 'ellos/ellas/ustedes'.
Related Translations
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