interferir Negative Imperative Conjugation
interferir — to interfere
The negative imperative always uses the present subjunctive forms: no interfieras, no interfiera.
interferir Negative Imperative Forms
When to Use the Negative Imperative
Crucial for telling people to stay out of your business or to stop interrupting.
Notes on interferir in the Negative Imperative
Since it uses the subjunctive, remember the 'ie' change for most forms and the 'i' change for nosotros (no interfiramos).
Example Sentences
¡No interfieras en mis asuntos!
Don't interfere in my business!
tú
Por favor, no interfieran con el equipo médico.
Please, do not interfere with the medical equipment.
ustedes
Common Mistakes
Mistake: No interfiere.
Correct: No interfieras.
Why: Negative commands must use the subjunctive, not the indicative 'tú' form.
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Related Tenses
Present
yo: interfiero
Interferir is a stem-changing verb in the present tense (e -> ie), except for nosotros and vosotros.
Preterite
yo: interferí
Interferir has a third-person stem change (e -> i) in the preterite: interfirió and interfirieron.
Imperfect
yo: interfería
Interferir is completely regular in the imperfect: interfería, interferías, interfería...
Future
yo: interferiré
Interferir is regular in the future; simply add endings to the infinitive.
Conditional
yo: interferiría
The conditional of interferir is regular: interferiría, interferirías, etc.
Present Subjunctive
yo: interfiera
Interferir has a stem change (ie) and a special nosotros/vosotros change (i) in the subjunctive.
Imperfect Subjunctive
yo: interfiriera
The imperfect subjunctive uses the 'interfir-' stem for all forms (interfiriera, interfirieras).
Affirmative Imperative
yo: interfiere
Use 'interfiere' to tell someone to step in, or 'interfiera' for formal requests.