Quick answer: After expressions of necessity and will, such as il faut que, il est important que, vouloir que and exiger que, French uses que plus the subjunctive when the two clauses have different subjects. This French 3 quiz checks subjunctive after necessity and will with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.
Ten short questions on the subjunctive after il faut que, vouloir que and exiger que, and on the choice of the infinitive. Pick one answer, then read the explanation. Wrong answers are real learner mistakes, so use them to find your weak spot.