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

Introduction to the verb déméthaniser

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The English translation of the French verb déméthaniser is “to demethanize.” It is pronounced as “day-meh-tah-nee-zay.”

The verb déméthaniser is composed of two parts: “dé,” which is a prefix meaning “remove” or “undo,” and “méthaniser,” which is derived from the noun “méthane,” meaning methane. It was first used in the late 19th century in the field of chemistry, specifically in the process of removing methane from a substance.

In everyday French, the verb déméthaniser is most often used in the Subjonctif Plus-que-parfait tense to express an action that was supposed to have happened in the past but did not. This tense is formed with the auxiliary verb “avoir” or “être” in the Plus-que-parfait tense and the past participle of the verb.

Here are three simple examples of its usage in the Subjonctif Plus-que-parfait tense with their English translations:

  1. Il fallait que nous ayons déméthanisé le sol avant la construction. (It was necessary for us to have demethanized the soil before construction.)
  2. J’aurais préféré que tu aies déméthanisé le gaz avant de l’utiliser. (I would have preferred for you to have demethanized the gas before using it.)
  3. Il est dommage que vous ayez déméthanisé cette source d’énergie renouvelable. (It is a shame that you have demethanized this renewable energy source.)

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

Pronoun Conjugation Example Usage English Translation
je eusse déméthanisé Il aurait été mieux que je eusse déméthanisé. It would have been better if I had demethanized.
tu eusses déméthanisé Il aurait été mieux que tu eusses déméthanisé. It would have been better if you had demethanized.
il eût déméthanisé Il aurait été mieux qu’il eût déméthanisé. It would have been better if he had demethanized.
elle eût déméthanisé Il aurait été mieux qu’elle eût déméthanisé. It would have been better if she had demethanized.
on eût déméthanisé Il aurait été mieux qu’on eût déméthanisé. It would have been better if one had demethanized.
nous eussions déméthanisé Il aurait été mieux que nous eussions déméthanisé. It would have been better if we had demethanized.
vous eussiez déméthanisé Il aurait été mieux que vous eussiez déméthanisé. It would have been better if you had demethanized.
ils eussent déméthanisé Il aurait été mieux qu’ils eussent déméthanisé. It would have been better if they had demethanized.
elles eussent déméthanisé Il aurait été mieux qu’elles eussent déméthanisé. It would have been better if they had demethanized.

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

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

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

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Déméthaniser – About the French Subjonctif Plus-que-parfait (Subjunctive Pluperfect) Tense

The French Subjonctif Plus-que-parfait, also known as the Pluperfect Subjunctive, is a verb tense used to express actions or states that occurred before another action in the past, and it’s used in situations where the indicative mood is in the past subjunctive or conditional mood.
NOTE: To take a deep dive into all the French tenses then see my article on Mastering French Tense Conjugation.

Formation

To form the Subjonctif Plus-que-parfait, you start with the imperfect subjunctive form of the auxiliary verb “avoir” or “être,” followed by the past participle of the main verb. 
For “avoir” verbs: Take the imperfect subjunctive form of “avoir” (e.g., j’eusse, tu eusses, il/elle eût, nous eussions, vous eussiez, ils/elles eussent). Add the past participle of the main verb. 
For “être” verbs: Take the imperfect subjunctive form of “être” (e.g., je fusse, tu fusses, il/elle fût, nous fussions, vous fussiez, ils/elles fussent). Add the past participle of the main verb.

Common Everyday Usage Patterns

Hypothetical Situations

The Subjonctif Plus-que-parfait is often used to express hypothetical or unreal actions that occurred before another past action.
For example: J’aurais aimé que tu aies fini ton travail avant que je sois arrivé. (I would have liked for you to have finished your work before I arrived.) 

Reported Speech

In reported speech, you may use the Subjonctif Plus-que-parfait to convey what someone said or thought in the past. 
For example: Il m’a dit qu’il avait peur que je n’aie pas compris. (He told me that he was afraid that I hadn’t understood.) 

Doubt, Wishes, and Emotions

This tense can also be used to express doubt, wishes, and emotions about past actions. 
For example: Je doutais qu’il eût dit la vérité. (I doubted that he had told the truth.) 
J’aurais souhaité que tu fusses venu. (I would have wished for you to have come.)

Interactions with Other Tenses

Present Subjunctive

The Subjonctif Plus-que-parfait can be used to describe past actions when the main verb is in the present subjunctive. 
For example: “Il faut que j’aie fini mon travail avant que tu partes.” (I must have finished my work before you leave.) 

Imperfect Subjunctive

It’s common to use the Subjonctif Plus-que-parfait with the imperfect subjunctive in complex sentences. 
For example: “Il m’avait dit qu’il fût rentré avant la fin de la journée.” (He had told me that he had returned before the end of the day.) 

Conditional

When the main verb is in the conditional mood, the Subjonctif Plus-que-parfait can be used to express past unreal conditions. 
For example: “Si j’avais su, j’aurais voulu que tu aies réussi.” (If I had known, I would have wanted you to have succeeded.)

Summary

The Subjonctif Plus-que-parfait is a complex tense used to convey nuanced meanings in French. While its usage may seem intricate, it becomes more intuitive with practice and exposure to the language. It’s important to understand the context in which it’s used, as it often conveys subtleties of time, conditionality, and emotion in French sentences.

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