intervenir Imperfect Conjugation
intervenir — to intervene
The imperfect of intervenir is regular: intervenía, intervenías, intervenía...
intervenir Imperfect Forms
When to Use the Imperfect
Use the imperfect to describe habitual involvement in the past or to set the scene (e.g., 'The UN was intervening while the war continued').
Notes on intervenir in the Imperfect
Intervenir is completely regular in the imperfect. It uses the standard -ía endings for -ir verbs.
Example Sentences
Antes, el estado intervenía más en la economía.
Before, the state used to intervene more in the economy.
él/ella/usted
Nosotros siempre interveníamos para evitar peleas.
We always used to step in to avoid fights.
nosotros
Tú intervenías con frecuencia en clase.
You used to participate frequently in class.
tú
Common Mistakes
Mistake: Forgeting the accent on the 'í'.
Correct: intervenía
Why: All imperfect forms of -ir verbs require an accent on the letter 'i'.
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Related Tenses
Present
yo: intervengo
Intervenir is irregular in the present, featuring a 'g' in the 'yo' form and an 'ie' stem change in others.
Preterite
yo: intervine
Intervenir is highly irregular in the preterite, following the 'u-stem' pattern (intervin-).
Future
yo: intervendré
The future tense of intervenir uses the irregular stem 'intervendr-'.
Conditional
yo: intervendría
The conditional uses the irregular stem 'intervendr-' followed by regular -ía endings.
Present Subjunctive
yo: intervenga
Intervenir is irregular in the present subjunctive, using the stem 'interveng-' for all persons.
Imperfect Subjunctive
yo: interviniera
The imperfect subjunctive uses the irregular stem 'intervinier-' for all forms.
Affirmative Imperative
yo: intervén
The imperative uses the short form 'intervén' for the informal 'tú' command.
Negative Imperative
yo: no intervengas
The negative imperative always uses the present subjunctive forms with 'no'.