fallar Negative Imperative Conjugation
fallar — to fail
Negative commands use 'no' + present subjunctive: no falles (tú), no falle (usted), no falléis (vosotros), no fallen (ustedes).
fallar Negative Imperative Forms
When to Use the Negative Imperative
Use negative commands when telling someone not to do something. For 'fallar', it means instructing someone not to fail.
Notes on fallar in the Negative Imperative
Negative commands are formed using the present subjunctive. Fallar is regular in the present subjunctive.
Example Sentences
No falles en tu presentación.
Don't fail your presentation.
tú
Por favor, no falle en este punto crucial.
Please, do not fail on this crucial point.
usted
No falléis la oportunidad de aprender.
Don't miss the opportunity to learn.
vosotros
No fallen en su deber.
Do not fail in your duty.
Common Mistakes
Mistake: Using the infinitive instead of the subjunctive.
Correct: Use 'no falles' (tú), not 'no fallar'.
Why: Negative commands for tú, usted, ustedes, nosotros, and vosotros are formed with the present subjunctive.
Mistake: Confusing the vosotros negative imperative with the affirmative.
Correct: The negative is 'no falléis', not 'no fallad'.
Why: The vosotros negative imperative uses the present subjunctive form.
Master Spanish verbs in context
Memorizing tables only gets you so far. Read 200+ illustrated and narrated Spanish stories to see verbs like 'fallar' used naturally — in the tenses you're learning.
Related Tenses
Present
yo: fallo
The present tense of fallar (fallo, fallas, falla, fallamos, falláis, fallan) describes current or habitual failures.
Preterite
yo: fallé
The preterite of fallar is regular: fallé, fallaste, falló, fallamos, fallasteis, fallaron, for completed past actions.
Imperfect
yo: fallaba
The imperfect of fallar (fallaba, fallabas, fallaba, fallábamos, fallabais, fallaban) describes ongoing or habitual past failures.
Future
yo: fallaré
The future tense of fallar (fallaré, fallarás, fallará, fallaremos, fallaréis, fallarán) indicates actions that will happen.
Conditional
yo: fallaría
The conditional of fallar (fallaría, fallarías, fallaría, fallaríamos, fallaríais, fallarían) expresses 'would' fail or polite possibilities.
Present Subjunctive
yo: falle
Use the present subjunctive of fallar (falle, falles, falle, fallemos, falléis, fallen) for wishes, doubts, and emotions.
Imperfect Subjunctive
yo: fallara
The imperfect subjunctive (fallara, fallaras, fallara, falláramos, fallarais, fallaran) is for past hypotheticals, wishes, or doubts.
Affirmative Imperative
yo: falla
Use the imperative of fallar for direct commands: falla (tú), falle (usted), fallad (vosotros), fallen (ustedes).