interponer Preterite Conjugation
interponer — to file
Interponer is highly irregular in the preterite, using the stem 'interpusi-' with special endings.
interponer Preterite Forms
When to Use the Preterite
Use the preterite for completed actions in the past, like the specific moment a lawyer filed a document.
Notes on interponer in the Preterite
It follows the pattern of 'poner'. The stem changes to 'interpusi-' and the endings are the irregular preterite set (e, iste, o, imos, isteis, ieron) without accents.
Example Sentences
Ayer interpuse una reclamación en la oficina.
Yesterday I filed a claim at the office.
yo
El abogado interpuso el recurso el lunes pasado.
The lawyer filed the appeal last Monday.
él/ella/usted
Ellos interpusieron la demanda hace dos meses.
They filed the lawsuit two months ago.
ellos/ellas/ustedes
Common Mistakes
Mistake: Writing 'interponí' or 'interponió'.
Correct: interpuse / interpuso
Why: Interponer follows the irregular 'poner' pattern, not the regular -er verb pattern.
Mistake: Adding an accent to 'interpuso'.
Correct: interpuso
Why: Irregular preterites like this one do not have accents on the 1st or 3rd person singular.
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Related Tenses
Present
yo: interpongo
The present is regular except for the 'yo' form, which adds a 'g' (interpongo).
Imperfect
yo: interponía
The imperfect of interponer is completely regular: interponía, interponías, etc.
Future
yo: interpondré
The future tense uses the irregular stem 'interpondr-' followed by standard future endings.
Conditional
yo: interpondría
The conditional uses the irregular stem 'interpondr-' (the same as the future).
Present Subjunctive
yo: interponga
The present subjunctive of interponer follows the 'yo' form (interpongo), resulting in interpong- endings.
Imperfect Subjunctive
yo: interpusiera
The imperfect subjunctive uses the irregular 'interpusi-' stem derived from the preterite.
Affirmative Imperative
yo: interpón
The imperative uses 'interpón' for tú and 'interponga' for formal commands.
Negative Imperative
yo: no interpongas
The negative imperative uses 'no' plus the present subjunctive forms (interpongas).