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

ByMichael Burns

Introduction to the verb déméthaniser

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The English translation of the French verb déméthaniser is “to demethanize.” It is pronounced as “deh-may-ta-nee-zay.”

The verb déméthaniser is derived from the combination of the prefix “dé” meaning “to remove” and the noun “méthane,” which refers to a colorless, odorless gas often used as fuel. It is most often used in the context of environmental protection, to describe the process of removing methane gas from a particular area or source.

In everyday French, the Conditionnel Passé tense is used to express a hypothetical or uncertain action that would have occurred in the past. In the context of environmental protection, déméthaniser in this tense would refer to a past action that could have potentially prevented the release of methane gas.

Here are three examples of its usage in this tense:

  1. Si nous avions déméthanisé le site industriel, nous aurions évité la pollution de l’air. (If we had demethanized the industrial site, we would have avoided air pollution.)

  2. Ils auraient pu déméthaniser la décharge avant qu’elle ne devienne un risque environnemental. (They could have demethanized the landfill before it became an environmental hazard.)

  3. Si le gouvernement avait déméthanisé les exploitations agricoles, les émissions de gaz à effet de serre auraient été considérablement réduites. (If the government had demethanized the farms, greenhouse gas emissions would have been significantly reduced.)

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

Pronoun Conjugation Example Usage English Translation
je aurais déméthanisé Si j’avais su, j’aurais déméthanisé l’eau. If I had known, I would have removed the methanol from the water.
tu aurais déméthanisé Tu aurais déméthanisé cette boisson. You would have removed the methanol from this drink.
il aurait déméthanisé Il aurait déméthanisé l’air ambiant. He would have removed the methanol from the ambient air.
elle aurait déméthanisé Elle aurait déméthanisé son moteur. She would have removed the methanol from her engine.
on aurait déméthanisé On aurait déméthanisé l’atmosphère. One would have removed the methanol from the atmosphere.
nous aurions déméthanisé Nous aurions déméthanisé le carburant. We would have removed the methanol from the fuel.
vous auriez déméthanisé Vous auriez déméthanisé la source. You would have removed the methanol from the source.
ils auraient déméthanisé Ils auraient déméthanisé leur production. They would have removed the methanol from their production.
elles auraient déméthanisé Elles auraient déméthanisé le liquide. They (female) would have removed the methanol from the liquid.

Other Conjugations for Déméthaniser.

    

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

    Imparfait (Imperfect) Tense Conjugation of the French Verb déméthaniser
     

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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Déméthaniser – 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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