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

ByMichael Burns

Introduction to the verb déphosphorer

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The English translation of the French verb déphosphorer is “to dephosphorize.” It is pronounced as “day-fos-for-ray” in its infinitive form.

The word déphosphorer is derived from the French prefix “dé-“, which means “undo” or “remove,” and the word “phosphore,” which means “phosphorus.” It is a technical term often used in chemistry and metallurgy to describe the process of removing phosphorus from a substance.

In everyday French, déphosphorer is most often used in the Subjonctif Plus-que-parfait tense to express a hypothetical or unreal past action. This tense is formed by using the auxiliary verb “avoir” or “être” in the Subjonctif Imparfait tense, followed by the past participle of déphosphorer.

Here are three examples of déphosphorer used in the Subjonctif Plus-que-parfait tense, with their English translations:

  1. Si j’avais déphosphoré le métal, il aurait été plus résistant. (If I had dephosphorized the metal, it would have been more resistant.)
  2. Il était possible que tu aies déphosphoré l’eau pour la rendre potable. (It was possible that you had dephosphorized the water to make it drinkable.)
  3. Nous aurions préféré que vous n’ayez pas déphosphoré cette substance chimique. (We would have preferred if you had not dephosphorized this chemical substance.)

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

Pronoun Conjugation Example Usage English Translation
je eusse déphosphoré Il était nécessaire que je eusse déphosphoré. It was necessary for me to have dephosphorized.
tu eusses déphosphoré Il était nécessaire que tu eusses déphosphoré. It was necessary for you to have dephosphorized.
il eût déphosphoré Il était nécessaire qu’il eût déphosphoré. It was necessary for him to have dephosphorized.
elle eût déphosphoré Il était nécessaire qu’elle eût déphosphoré. It was necessary for her to have dephosphorized.
on eût déphosphoré Il était nécessaire qu’on eût déphosphoré. It was necessary for one to have dephosphorized.
nous eussions déphosphoré Il était nécessaire que nous eussions déphosphoré. It was necessary for us to have dephosphorized.
vous eussiez déphosphoré Il était nécessaire que vous eussiez déphosphoré. It was necessary for you to have dephosphorized.
ils eussent déphosphoré Il était nécessaire qu’ils eussent déphosphoré. It was necessary for them to have dephosphorized.
elles eussent déphosphoré Il était nécessaire qu’elles eussent déphosphoré. It was necessary for them to have dephosphorized.

Other Conjugations for Déphosphorer.

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

    Imparfait (Imperfect) Tense Conjugation of the French Verb déphosphorer
   

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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Déphosphorer – 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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