What are the four types of subjunctive?

What are the four types of subjunctive? The subjunctive exists in four tenses: the present, imperfect, perfect and pluperfect. It occurs in both the active and passive voice. In addition to this, the endings of subjunctive verbs can alter across the conjugations.

The subjunctive exists in four tenses: the present, imperfect, perfect and pluperfect. It occurs in both the active and passive voice. In addition to this, the endings of subjunctive verbs can alter across the conjugations.