The French subjunctif

The French subjunctive corresponds with the English subjunctive.
In contrast to the English subjunctive, the French subjunctive is used on a more regular basis.
The speaker intends to express a desire or a personal expression of necessity, possibility or judgement.
The subjunctive is used in two different cases/situations:

Case 1:
The subject of the main clause and the subject of the dependent clause must differ, otherwise the indicative can be used as usual.

Case 2:
Dependent clauses starting with «que» or «qui» require the subjunctives if certain idioms are used before «que» or «qui». If there is an «de» instead of «que» or «qui» an indicative clause is required.