What verb do we use for the verbe auxiliaire (helping verb)?

"avoir" and "être" are auxilliary verbs.

Are you referring to the passé composé? Avoir with many verbs and être with "Dr & Mrs Vandertramp" (the verbs of coming, going, etc. Have you seen the "House of être?"

Sra (aka Mme)

To determine the verb used as the helping verb (verbe auxiliaire), you need to consider the context and the specific auxiliary verb being used. In English, there are three primary auxiliary verbs: "be," "have," and "do." These verbs are used to construct various tenses, forms, or conditions in a sentence.

1. "Be": It is used to form progressive tenses (e.g., present continuous, past continuous) and passive voice constructions. Examples include:
- "She is running." (present continuous)
- "The book was written." (past continuous)

2. "Have": It is used to form perfect tenses (e.g., present perfect, past perfect). Examples include:
- "They have finished their work." (present perfect)
- "He had already left when I arrived." (past perfect)

3. "Do": It is used to form questions and negations in present simple and past simple tenses. Examples include:
- "Do you like ice cream?" (question in present simple)
- "I did not see him yesterday." (negation in past simple)

The choice of which helping verb to use depends on the tense, aspect, mood, and voice needed in the sentence. By understanding the specific context and purpose of the sentence, you can determine the appropriate helping verb to use.