Practicing er-verbs and their endings; introducing new er verbs; making a liaison between the subject pronouns and the corresponding ending :ex: je… e , tu…es, il/elle/on—e; nous…ons etc…

conversely: one can surmise that if you are in the first person singular such as Je Parle that since e is the ending in the first person singular then the verb in its infinitive is an ER verb. So are es ,e , etc…