French Infinitives - Verb Mood
The infinitive is the basic, unconjugated form of a verb, sometimes called the name of the verb. We usually learn French verbs in the infinitive, since that is what you start with in order to conjugate them.
French Past Infinitive - Infinitif passé
The French past infinitive gives a command for something that must be done before a certain time.
The passive infinitive occurs when a sentence is written in such a way that the infinitive has a passive meaning.