Conditionnel Passé (Conditional Past) Tense Conjugation of the French Verb déraisonner

ByMichael Burns

Introduction to the verb déraisonner

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The English translation of the French verb déraisonner is “to talk nonsense” or “to reason illogically.” The infinitive form of the verb is pronounced as “day-ray-zo-nay.”

The language origin of déraisonner comes from the combination of the prefix “dé-” meaning “to remove” and the verb “raisonner” which means “to reason.” It can therefore be understood as “to remove reason.”

In everyday French, déraisonner is most often used in the Conditionnel Passé tense, which expresses an action that would have happened in the past if certain conditions were met. It is typically used to express a hypothetical or imagined situation.

Three simple examples of déraisonner in the Conditionnel Passé tense are:

  1. Si j’avais déraisonné, j’aurais fait des choix complètement différents dans ma vie. (If I had talked nonsense, I would have made completely different choices in my life.)

  2. Elle aurait déraisonné si elle avait cru ses propres mensonges. (She would have talked nonsense if she had believed her own lies.)

  3. Nous aurions déraisonné si nous avions cru que c’était possible de voler. (We would have talked nonsense if we had believed that it was possible to fly.)

English translations:

  1. If I had talked nonsense, I would have made completely different choices in my life.

  2. She would have talked nonsense if she had believed her own lies.

  3. We would have talked nonsense if we had believed that it was possible to fly.

Table of the Conditionnel Passé (Conditional Past) Tense Conjugation of déraisonner

Pronoun Conjugation Example Usage English Translation
je aurais déraisonné Si j’avais bu, j’aurais déraisonné. I would have acted irrationally if I had drunk.
tu aurais déraisonné Tu aurais déraisonné sans réfléchir. You would have acted irrationally without thinking.
il aurait déraisonné Il aurait déraisonné en public. He would have acted irrationally in public.
elle aurait déraisonné Elle aurait déraisonné par nervosité. She would have acted irrationally out of nervousness.
on aurait déraisonné On aurait déraisonné devant le danger. One would have acted irrationally in the face of danger.
nous aurions déraisonné Nous aurions déraisonné ensemble. We would have acted irrationally together.
vous auriez déraisonné Vous auriez déraisonné dans cette situation. You would have acted irrationally in this situation.
ils auraient déraisonné Ils auraient déraisonné en riant. They would have acted irrationally while laughing.
elles auraient déraisonné Elles auraient déraisonné par colère. They (female) would have acted irrationally out of anger.

Other Conjugations for Déraisonner.

    

    Le Present (Present Tense) Conjugation of the French Verb déraisonner
     

    Imparfait (Imperfect) Tense Conjugation of the French Verb déraisonner
     

    Passé Simple (Simple Past) Tense Conjugation of the French Verb déraisonner
     

    Passé Composé (Present Perfect) Tense Conjugation of the French Verb déraisonner
     

    Futur Simple (Simple Future) Tense Conjugation of the French Verb déraisonner
     

    Futur Proche (Near Future) Tense Conjugation of the French Verb déraisonner
     

    Plus-que-parfait (Pluperfect) Tense Conjugation of the French Verb déraisonner
     

    Passé Antérieur (Past Anterior) Tense Conjugation of the French Verb déraisonner

    Futur Antérieur (Future Anterior) Tense Conjugation of the French Verb déraisonner

    Subjonctif Présent (Subjunctive Present) Tense Conjugation of the French Verb déraisonner

    Subjonctif Passé (Subjunctive Past) Tense Conjugation of the French Verb déraisonner
     

    Subjonctif Imparfait (Subjunctive Imperfect) Tense Conjugation of the French Verb déraisonner

    Subjonctif Plus-que-parfait (Subjunctive Pluperfect) Tense Conjugation of the French Verb déraisonner
     

    Conditionnel Présent (Conditional Present) Tense Conjugation of the French Verb déraisonner
     

    Conditionnel Passé (Conditional Past) Tense Conjugation of the French Verb déraisonner  (this article)

    L’impératif Présent (Imperative Present) Tense Conjugation of the French Verb déraisonner

    L’infinitif Présent (Infinitive Present) Tense Conjugation of the French Verb déraisonner


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Déraisonner – About the French Conditionnel Passé (Conditional Past) Tense

The French “Conditionnel Passé” is a compound tense used to express hypothetical or unreal actions in the past. It is formed by combining the conditional of the auxiliary verb “avoir” or “être” and the past participle of the main verb.

NOTE: To take a deep dive into all the French tenses then see my article on Mastering French Tense Conjugation.

Formation

Start with the conditional of the auxiliary verb: For most verbs, use “aurais” (for “avoir”) or “serais” (for “être”) as the conditional form. 

With “avoir”: j’aurais, tu aurais, il/elle/on aurait, nous aurions, vous auriez, ils/elles auraient. 
With “être”: je serais, tu serais, il/elle/on serait, nous serions, vous seriez, ils/elles seraient. 

Add the past participle of the main verb to this conditional form. 
For example, if you want to say “I would have done,” you would use “j’aurais fait.” If you want to say “She would have gone,” you would use “elle serait allée.”

Common Everyday Usage Patterns

Expressing Unreal Past Scenarios

The Conditionnel Passé is often used to talk about actions that did not happen in the past, but you are speculating about what would have occurred if they had. It’s a way to discuss hypothetical situations in the past. 

Si j’avais su, je t’aurais aidé. (If I had known, I would have helped you.)
Il serait venu s’il avait eu le temps. (He would have come if he had had the time.) 

Polite Requests or Suggestions

It can be used to make polite requests or suggestions in the past. 

Pourriez-vous m’aider, s’il vous plaît ? (Could you have helped me, please?) 

Expressing Doubt or Uncertainty

It can convey doubt or uncertainty regarding past events.

Il aurait peut-être oublié notre rendez-vous. (He might have forgotten our appointment.)

Interactions with Other Tenses

Conditional Present

You can use the Conditionnel Passé in combination with the conditional present to describe past actions that were hypothetical at the time they were spoken about. J’aurais aimé que tu m’appelles hier. (I would have liked you to call me yesterday.) 

Indicative Past Tenses

You might use the Conditionnel Passé alongside indicative past tenses like the passé composé to contrast hypothetical and real past events. Il est venu hier, mais s’il avait pu, il serait venu la semaine dernière. (He came yesterday, but if he could have, he would have come last week.) 

Conditional Future

In some cases, you can use the Conditionnel Passé in combination with the conditional future to discuss unreal past events that could have consequences in the future. Si j’avais réussi mon examen, j’aurais un meilleur travail. (If I had passed my exam, I would have a better job.)

Summary

In summary, the Conditionnel Passé is used to express hypothetical or unreal actions in the past. It is often used in conjunction with other tenses to convey various nuances in French, allowing speakers to discuss imaginary past scenarios, make polite requests, or express doubt about past events.

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