How do you form The Pluperfect tense in French?

Tُhe pluperfect tense, also known as "plus-que-parfait," is used to express an action that occurred before another action in the past. It is formed using the imperfect tense of the auxiliary verb "avoir" or "être," followed by the past participle of the main verb.

Here's how you form the pluperfect tense: 

With the Auxiliary Verb "Avoir":

• Conjugate the auxiliary verb "avoir" in the imperfect tense according to the subject pronoun.

• Add the past participle of the main verb.
  
  Example: J'avais mangé (I had eaten), Tu avais parlé (You had spoken).

With the Auxiliary Verb "Être":

• Conjugate the auxiliary verb "être" in the imperfect tense according to the subject pronoun. Remember to make the past participle agree in gender and number with the subject.

• Add the past participle of the main verb.
  
  Example: J'étais parti(e) (I had left), Tu étais allé(e) (You had gone).

The pluperfect tense is used to describe an action that had occurred before another action in the past. It is often used in conjunction with the passé composé or another past tense to indicate the sequence of events in the past.