comprobar Present Conjugation
comprobar — to check
Comprobar is a stem-changing verb (o > ue) in all forms except nosotros and vosotros.
comprobar Present Forms
When to Use the Present
Use the present tense for habitual checking, general facts, or things you are verifying right now.
Notes on comprobar in the Present
This is a radical changing verb. The 'o' in the stem changes to 'ue' when stressed (compruebo, compruebas, comprueba, comprueban).
Example Sentences
Siempre compruebo mi correo por la mañana.
I always check my email in the morning.
yo
Ella comprueba los datos antes de enviarlos.
She checks the data before sending them.
él/ella/usted
Nosotros comprobamos la temperatura cada hora.
We check the temperature every hour.
nosotros
Common Mistakes
Mistake: Saying 'comprobo' instead of 'compruebo'.
Correct: compruebo
Why: The stem must change from 'o' to 'ue' in the first person singular.
Mistake: Saying 'compruebamos' for we.
Correct: comprobamos
Why: The nosotros and vosotros forms never take the stem change in the present indicative.
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Related Tenses
Preterite
yo: comprobé
The preterite of comprobar is regular: comprobé, comprobaste, comprobó, comprobamos, comprobasteis, comprobaron.
Imperfect
yo: comprobaba
The imperfect of comprobar is regular: comprobaba, comprobabas, comprobaba, comprobábamos, comprobabais, comprobaban.
Future
yo: comprobaré
The future of comprobar is regular: comprobaré, comprobarás, comprobará, comprobaremos, comprobaréis, comprobarán.
Conditional
yo: comprobaría
The conditional of comprobar is regular: comprobaría, comprobarías, comprobaría, comprobaríamos, comprobaríais, comprobarían.
Present Subjunctive
yo: compruebe
The present subjunctive follows the stem change (o > ue): compruebe, compruebes, compruebe, comprobemos, comprobéis, comprueben.
Imperfect Subjunctive
yo: comprobara
The imperfect subjunctive is regular: comprobara, comprobaras, comprobara, comprobáramos, comprobarais, comprobaran.
Affirmative Imperative
yo: comprueba
Use 'comprueba' (tú) or 'compruebe' (usted) to tell someone to check something.
Negative Imperative
yo: no compruebes
Negative commands use the present subjunctive: no compruebes, no compruebe, no comprobemos, no comprobéis, no comprueben.