requerir Preterite Conjugation
requerir — to require
Requerir is a 'slipper verb', changing e to i only in the third-person forms (requirió, requirieron).
requerir Preterite Forms
When to Use the Preterite
Use the preterite for specific instances in the past where a requirement was met or a formal demand was made at a specific moment.
Notes on requerir in the Preterite
It is regular in most forms except the 'basement' (third person singular and plural), where the 'e' becomes 'i'.
Example Sentences
El jefe requirió mi presencia en la oficina.
The boss requested my presence in the office.
él/ella/usted
Los trámites requirieron mucho esfuerzo.
The procedures required a lot of effort.
ellos/ellas/ustedes
Requerí asistencia médica después del accidente.
I required medical assistance after the accident.
yo
Common Mistakes
Mistake: Using 'requerió' instead of 'requirió'.
Correct: The correct form is requirió.
Why: -ir verbs with an 'e' in the stem often change to 'i' in the third-person preterite.
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Related Tenses
Present
yo: requiero
Requerir follows an e to ie stem change in all forms except nosotros and vosotros.
Imperfect
yo: requería
The imperfect of requerir is regular: requería, requerías, requería...
Future
yo: requeriré
The future tense of requerir is regular: requeriré, requerirás, requerirá...
Conditional
yo: requeriría
The conditional of requerir is regular: requeriría, requerirías, requeriría...
Present Subjunctive
yo: requiera
Requerir changes its stem from e to ie (requiera) and e to i in the nosotros/vosotros forms (requiramos).
Imperfect Subjunctive
yo: requiriera
The imperfect subjunctive of requerir uses the 'requir-' stem derived from the preterite third person.
Affirmative Imperative
yo: requiere
The imperative uses 'requiere' for tú and 'requiera(n)' for formal commands.
Negative Imperative
yo: no requieras
The negative imperative uses 'no' plus the present subjunctive forms.