The past subjunctive is the past tense of the subjunctive mood. The exact same verbs, expressions, and conjunctions that call for the subjunctive in the present require the past subjunctive in reference to subjectivity about something that happened in the past.
J'ai été pendant plus de trois ans le jouet d'une illusion singulière et diabolique. Moi, pauvre prêtre de campagne, j'ai mené en rêve toutes les nuits (Dieu veuille que ce soit un rêve !) une vie de damné, une vie de mondain et de Sardanapale.
Indefinite adjectives like certains, divers, and quelques describe nouns in a general or non-specific way. Many indefinite adjectives indicate a vague quantity.
Every country and continent has an adjective that can be used to describe people and things from that place. Those same adjectives can also be used as nouns to refer to people from that place, with one small change in French.
Entre janvier et mai 1968, diverses perturbations initiées par le milieu étudiant ont conduit à ce qui allait devenir le mouvement de protestation le plus considérable que la France ait connu.
The causative is a grammatical construction with a lazy subject who, rather than performing some action himself, is making someone or something else do it: to make something happen, to have something done.