Used interchangeably, the past (imperfect) subjunctive can end either in "-se" or "-ra". Both forms stem from the third-person plural (ellos, ellas, ustedes) of the preterite. For example, the verb "estar", when conjugated in the third-person plural of the preterite, becomes "estuvieron". Then, drop the "-ron" ending, and add either "-se" or "-ra". Thus, it becomes "estuviese" or "estuviera". The past subjunctive may be used with "if... then" statements with the conditional mood.

Example:Si yo fuera/fuese el maestro, no mandaría demasiados deberes. (If I were the teacher, I would not give too much homework.) Hablo Español nativo y pienso que el subjuntivo es parte fundamental del español, usalo  para situaciones hipotéticas o contrafácticas.

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