interferir Imperfect Conjugation
interferir — to interfere
Interferir is completely regular in the imperfect: interfería, interferías, interfería...
interferir Imperfect Forms
When to Use the Imperfect
Use the imperfect to describe ongoing or habitual interference in the past, or to set the scene (e.g., 'The signal was interfering when...').
Notes on interferir in the Imperfect
There are no irregularities here. Just use the standard -ía endings for -ir verbs.
Example Sentences
Antes, mi familia siempre interfería en mis decisiones.
Before, my family always used to interfere in my decisions.
él/ella/usted
La señal de radio interfería constantemente.
The radio signal was interfering constantly.
él/ella/usted
Nosotros no interferíamos en sus planes.
We weren't interfering in their plans.
nosotros
Common Mistakes
Mistake: interferaba
Correct: interfería
Why: Learners sometimes use -ar verb endings (-aba) for -ir verbs like interferir.
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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.
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.
Negative Imperative
yo: no interfieras
The negative imperative always uses the present subjunctive forms: no interfieras, no interfiera.