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

ByMichael Burns

Introduction to the verb déshydrogéner

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The English translation of the French verb déshydrogéner is “to dehydrogenate.” It is pronounced as “day-shy-dro-zhey-nay.”

The language origin of déshydrogéner comes from the combination of the prefix “dés-” meaning “to remove” and the root word “hydrogène” meaning “hydrogen.” It is used in chemistry to describe the process of removing hydrogen from a compound or molecule.

In everyday French, déshydrogéner is most often used in the Subjonctif Plus-que-parfait tense when talking about a hypothetical or unreal condition in the past. This tense is formed by using the auxiliary verb “avoir” in the Subjonctif Imparfait tense followed by the past participle of déshydrogéner.

Three simple examples of déshydrogéner in the Subjonctif Plus-que-parfait tense are:

  1. Il aurait fallu que je déshydrogénasse le benzène pour que la réaction se produise. (I would have had to dehydrogenate the benzene for the reaction to occur.)

  2. Nous aurions aimé que tu déshydrogénasses ce composé chimique avant de l’utiliser. (We would have liked for you to dehydrogenate this chemical compound before using it.)

  3. Il est possible que vous ayez déshydrogéné le méthane sans le savoir. (It is possible that you dehydrogenated the methane without knowing it.)

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

Pronoun Conjugation Example Usage English Translation
je eusse déshydrogéné Il faut que je eusse déshydrogéné cette molécule. I had to have dehydrogenated this molecule.
tu eusses déshydrogéné Je suis content que tu eusses déshydrogéné cette molécule. I’m glad you had dehydrogenated this molecule.
il eût déshydrogéné Il est possible qu’il eût déshydrogéné cette molécule. It’s possible he had dehydrogenated this molecule.
elle eût déshydrogéné Il se peut qu’elle eût déshydrogéné cette molécule. It’s possible she had dehydrogenated this molecule.
on eût déshydrogéné Il est probable qu’on eût déshydrogéné cette molécule. It’s probable one had dehydrogenated this molecule.
nous eussions déshydrogéné Je suis heureux que nous eussions déshydrogéné cette molécule. I’m happy that we had dehydrogenated this molecule.
vous eussiez déshydrogéné Je suis reconnaissant que vous eussiez déshydrogéné cette molécule. I’m grateful that you had dehydrogenated this molecule.
ils eussent déshydrogéné Il est dommage que ils eussent déshydrogéné cette molécule. It’s a shame they had dehydrogenated this molecule.
elles eussent déshydrogéné Il est important que elles eussent déshydrogéné cette molécule. It’s important they had dehydrogenated this molecule.

Other Conjugations for Déshydrogéner.

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

    Imparfait (Imperfect) Tense Conjugation of the French Verb déshydrogéner
   

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    Struggling with French verbs or the language in general? Why not use our free French Grammar Checker – no registration required!
   

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Déshydrogéner – 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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