1. The problem: Learn how to form and use the passé composé tense in French. 2. Formula: The passé composé is formed using the present tense of the auxiliary verb (either **avoir** or **être**) + the past participle of the main verb. 3. Important rules: - Most verbs use **avoir** as the auxiliary. - Some verbs, especially verbs of motion or reflexive verbs, use **être**. - When using **être**, the past participle must agree in gender and number with the subject. 4. Example with **avoir**: For the verb **manger** (to eat), the past participle is **mangé**. - Present tense of **avoir** for "je" is **ai**. - So, "I ate" = **j'ai mangé**. 5. Example with **être**: For the verb **aller** (to go), the past participle is **allé**. - Present tense of **être** for "elle" is **est**. - Since "elle" is feminine singular, add an **e** to the past participle. - So, "She went" = **elle est allée**. 6. Summary: To form passé composé, identify the auxiliary verb, conjugate it in present tense, find the past participle, and combine them. Remember agreement rules with **être**. This tense is used to express completed actions in the past.