to prevent, to warn
hablamos regular endingpienso stem changetengo irregularbusqué spelling change
Presente · What happens now or habitually
Prevengo los accidentes con mucho cuidado.
I prevent accidents by being very careful.
Pretérito · A completed action in the past
Mi vecino me previno del peligro.
My neighbor warned me of the danger.
Imperfecto · Ongoing or habitual past; "used to"
Las vacunas prevenían muchas enfermedades.
The vaccines prevented many diseases.
Futuro · What will happen
Esta crema prevendrá las quemaduras.
This cream will prevent burns.
Condicional · What would happen
Un buen techo prevendría esos daños.
A good roof would prevent that damage.
Pretérito perfecto · Has/have done
La vacuna ha prevenido muchas muertes.
The vaccine has prevented many deaths.
Pluscuamperfecto · Had done
Ya nos había prevenido del huracán.
He had already warned us about the hurricane.
Futuro perfecto · Will have done
Rarely used with this verb.
Condicional perfecto · Would have done
Un mejor plan habría prevenido el problema.
A better plan would have prevented the problem.
Presente de subjuntivo · Wishes, doubts, emotions about the present or future
Espero que esto prevenga más problemas.
I hope this prevents more problems.
Imperfecto de subjuntivo (-ra) · Hypotheticals and past wishes; the common form
Queríamos que la vacuna previniera la gripe.
We wanted the vaccine to prevent the flu.
Imperfecto de subjuntivo (-se) · Same meaning as -ra; more literary
Rarely used with this verb.
Pretérito perfecto de subjuntivo · Subjunctive for something that has happened
Me alegra que haya prevenido el accidente.
I'm glad he has prevented the accident.
Pluscuamperfecto de subjuntivo · Contrary-to-fact past: "if I had..."
Si nos hubieran prevenido, no habríamos ido.
If they had warned us, we wouldn't have gone.
Imperativo afirmativo · Commands: do it!
Prevén los accidentes con buenas llantas.
Prevent accidents with good tires.
Imperativo negativo · Commands: don't do it!
Rarely used with this verb.