prevenir Negative Imperative Conjugation
prevenir — to prevent
Negative commands use 'no' + present subjunctive: no prevengas, no prevenga.
prevenir Negative Imperative Forms
When to Use the Negative Imperative
Use to tell someone NOT to prevent something (perhaps because it is necessary or inevitable).
Notes on prevenir in the Negative Imperative
Uses the same 'preveng-' stem as the present subjunctive.
Example Sentences
No prevengas lo inevitable.
Don't prevent the inevitable.
tú
No prevenga el cambio, acéptelo.
Don't prevent the change, accept it.
No prevengáis el acceso a la información.
Don't prevent access to information.
vosotros
Common Mistakes
Mistake: no prevén
Correct: no prevengas
Why: Negative commands never use the affirmative imperative form; they always use the subjunctive.
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Related Tenses
Present
yo: prevengo
Prevenir is a stem-changing verb (e > ie) with a special 'yo' form: prevengo.
Preterite
yo: previne
Prevenir uses an irregular stem 'previn-' in the preterite: previne, previste, previno...
Imperfect
yo: prevenía
Prevenir is completely regular in the imperfect: prevenía, prevenías, prevenía...
Future
yo: prevendré
Prevenir uses the irregular stem 'prevendr-': prevendré, prevendrás, prevendrá.
Conditional
yo: prevendría
Prevenir uses the irregular stem 'prevendr-' plus -ía endings.
Present Subjunctive
yo: prevenga
The present subjunctive uses the 'preveng-' stem: prevenga, prevengas, prevenga.
Imperfect Subjunctive
yo: previniera
Based on the preterite stem: previniera, previnieras, previniera.
Affirmative Imperative
yo: prevén
The affirmative commands are: prevén (tú), prevenga (usted), prevengamos (nosotros).