mentir Future Conjugation
mentir — to lie
Mentir is completely regular in the future tense; just add the endings to the infinitive.
mentir Future Forms
When to Use the Future
Use this to predict a future lie or to express probability about whether someone is lying in the present ('I wonder if he is lying').
Notes on mentir in the Future
There are no stem changes or irregularities in the future tense for mentir.
Example Sentences
Si le preguntas, te mentirá.
If you ask him, he will lie to you.
él/ella/usted
No mentiré en el examen.
I will not lie on the exam.
yo
¿Nos mentirán otra vez?
Will they lie to us again?
ellos/ellas/ustedes
Common Mistakes
Mistake: Mientiré.
Correct: Mentiré.
Why: The future tense uses the full infinitive (mentir) as the base; it does not take the present tense stem change.
Master Spanish verbs in context
Memorizing tables only gets you so far. Read 200+ illustrated and narrated Spanish stories to see verbs like 'mentir' used naturally — in the tenses you're learning.
Related Tenses
Present
yo: miento
Mentir is a stem-changing verb (e > ie) in all forms except nosotros and vosotros.
Preterite
yo: mentí
Mentir changes its stem from 'e' to 'i' only in the third-person forms: mintió and mintieron.
Imperfect
yo: mentía
Mentir is regular in the imperfect: mentía, mentías, mentía, mentíamos, mentíais, mentían.
Conditional
yo: mentiría
The conditional of mentir is regular: mentiría, mentirías, mentiría, mentiríamos, mentiríais, mentirían.
Present Subjunctive
yo: mienta
Mentir changes to 'ie' in most forms, but importantly uses 'i' in the nosotros/vosotros forms.
Imperfect Subjunctive
yo: mintiera
The imperfect subjunctive of mentir uses the 'i' stem: mintiera, mintieras, mintiera...
Affirmative Imperative
yo: miente
Use 'miente' for informal commands and 'mienta' for formal ones.
Negative Imperative
yo: no mientas
All negative commands for mentir use the present subjunctive forms.