concluir Preterite Conjugation
concluir — to finish
The preterite of concluir features a 'y' in the third-person forms: concluyó and concluyeron.
concluir Preterite Forms
When to Use the Preterite
Use the preterite for actions that were completed at a specific point in the past, like finishing a book or a project yesterday.
Notes on concluir in the Preterite
The third-person singular (él/ella) and plural (ellos/ellas) swap the 'i' for a 'y' (concluyó, concluyeron). Other forms are regular but require accents.
Example Sentences
Concluí el informe anoche a las diez.
I finished the report last night at ten.
yo
El profesor concluyó la clase temprano.
The teacher finished the class early.
él/ella/usted
Concluimos el proyecto el mes pasado.
We finished the project last month.
nosotros
Los científicos concluyeron que el agua era potable.
The scientists concluded that the water was drinkable.
ellos/ellas/ustedes
Common Mistakes
Mistake: concluió
Correct: concluyó
Why: In Spanish, an unstressed 'i' between two vowels changes to a 'y'.
Mistake: conclui
Correct: concluí
Why: The 'yo' form needs an accent on the 'í' to show the stress is at the end.
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Related Tenses
Present
yo: concluyo
In the present tense, concluir is irregular: the 'i' changes to 'uy' in all forms except nosotros and vosotros.
Imperfect
yo: concluía
The imperfect of concluir is regular: concluía, concluías, concluía, concluíamos, concluíais, concluían.
Future
yo: concluiré
The future of concluir is regular: concluiré, concluirás, concluirá, concluiremos, concluiréis, concluirán.
Conditional
yo: concluiría
The conditional of concluir is regular: concluiría, concluirías, concluiría, concluiríamos, concluiríais, concluirían.
Present Subjunctive
yo: concluya
The present subjunctive of concluir uses the 'y' throughout: concluya, concluyas, concluya, concluyamos, concluyáis, concluyan.
Imperfect Subjunctive
yo: concluyera
The imperfect subjunctive of concluir uses the 'y' from the preterite: concluyera, concluyeras, concluyera...
Affirmative Imperative
yo: concluye
The imperative forms for concluir are: concluye (tú), concluya (usted), concluyamos (nosotros), concluid (vosotros), concluyan (ustedes).
Negative Imperative
yo: no concluyas
The negative imperative always uses the present subjunctive forms: no concluyas, no concluya, no concluyamos, no concluyáis, no concluyan.