Le Subjoncif
The subjunctive mood is used to express actions or ideas which are subjective or otherwise uncertain: will/wanting, emotion, doubt, possibility, necessity, and judgment. It is nearly always found in dependent clauses introduced by que or qui, and the subjects of the dependent and main clauses are usually different.
Je veux que tu le fasses.
I want you to do it.
Il faut que nous partions.
it is necessary that we leave.
Some irregular verbs and some verbs with spelling changes use two different stems (the verb form to which endings are added) to form the present subjunctive:
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The ils/elles stem of the present tense for je, tu, il/elle/on, ils/elles.
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The nous form of the present tense for nous and vous.
