The perfect tense is used to say what you did or what you have done in the past. To form the perfect tense you need a subject, an auxiliary verb and a past participle.

The perfect tense is used to say what you did or have done in the past. Past participles of verbs with 'être' as their auxiliary verb have to agree with the subject of the verb.

The imperfect tense is a past tense that is used to describe something that used to happen. It is also used to describe or give opinions about something or someone in the past.