mantener Future Conjugation
mantener — to keep
The future tense uses an irregular stem: mantendré, mantendrás, mantendrá.
mantener Future Forms
When to Use the Future
Use this to talk about what you will maintain or uphold in the future, or to make predictions about a situation staying the same.
Notes on mantener in the Future
The stem changes from 'mantener-' to 'mantendr-'. You add the standard future endings to this modified stem.
Example Sentences
Mantendremos la puerta cerrada.
We will keep the door closed.
nosotros
Mantendrás el equilibrio si practicas.
You will keep your balance if you practice.
tú
Common Mistakes
Mistake: manteneré
Correct: mantendré
Why: Mantener drops the 'e' and adds a 'd' in the future stem, rather than using the full infinitive.
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Related Tenses
Present
yo: mantengo
Mantener has a 'go' in the yo form and an e-to-ie stem change for others: mantengo, mantienes, mantiene.
Preterite
yo: mantuve
The preterite of mantener is highly irregular, using a 'uv' stem: mantuve, mantuviste, mantuvo, mantuvimos, mantuvisteis, mantuvieron.
Imperfect
yo: mantenía
Mantener is regular in the imperfect: mantenía, mantenías, mantenía.
Conditional
yo: mantendría
The conditional uses the same irregular stem as the future: mantendría, mantendrías, mantendría.
Present Subjunctive
yo: mantenga
The present subjunctive is based on the 'mantengo' stem: mantenga, mantengas, mantenga.
Imperfect Subjunctive
yo: mantuviera
The imperfect subjunctive uses the 'uv' stem from the preterite: mantuviera, mantuvieras, mantuviera.
Affirmative Imperative
yo: mantén
The imperative has a short 'tú' form: mantén, and uses subjunctive forms for others.
Negative Imperative
yo: no mantengas
The negative imperative always uses present subjunctive forms: no mantengas, no mantenga.