What is the Subjunctive form, and when is it used?

Despite misconceptions, the Subjunctive is not a tense, but rather a mood. It is used to express how the speaker feels about an action which has taken or will take place. It is generally used in subordinate clauses, however, can also be used in main clauses. It is often associated with phrases which are not definitely real, factual or fixed: For example - (1) impossibility/possibility: No es posible que nos veamos en el cole (2) Neccesity: Es importante que nos veamos en el cole (3) Hopes or desires: Deseo que nos veamos en el cole Usage of the subjunctive is obligitary after certain conjunctions, such as para que or como si (Which in turn, are used with a changing subject) For example - (1) Voy a darme prisa para que no lleguemos tarde. (2) Se comportaba como si fuera un niño The subjunctive is also used after 'when' phrases, such as 'cuando', indicating futre actions (However, remember, for the future, we use the present subjunctive). For example - (1) Ya habaremos mañana cuando nos veamos