interferir Affirmative Imperative Conjugation
interferir — to interfere
Use 'interfiere' to tell someone to step in, or 'interfiera' for formal requests.
interferir Affirmative Imperative Forms
When to Use the Affirmative Imperative
Use commands to tell someone to intervene (though usually, you'll use the negative to tell them NOT to).
Notes on interferir in the Affirmative Imperative
The 'tú' form uses the stem change (interfiere). The 'usted' and 'nosotros' forms match the present subjunctive.
Example Sentences
Interfiere solo si es absolutamente necesario.
Interfere only if it is absolutely necessary.
tú
Interfiera usted si ve que algo va mal.
Intervene (formal) if you see something going wrong.
usted
Common Mistakes
Mistake: interfere
Correct: interfiere
Why: The affirmative 'tú' command requires the e -> ie stem change.
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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).
Negative Imperative
yo: no interfieras
The negative imperative always uses the present subjunctive forms: no interfieras, no interfiera.