This is a handout that I give to my students when explaining the use of the subjunctive to express necessity or obligation.
This handout has two pages.
A review of three ways to express necessity/obligation without the subjonctif
--devoir + infinitif (présent and conditionnel)
--il faut + infinitif
Impersonal and personal expressions that require the use of the subjonctif along with a structural diagram for constructing a sentence
This document pairs nicely with my handout on subjunctive formation and my subjunctive review guide.
Students enjoy having this page in their notebook for quick reference. They also especially enjoy the review of the three structures on page 1 as they tend to forget those since they were learned in another level!