 The subjunctive is a form of a finite verb that is mostly used in hypothetical or nonfactual cases but also in special kinds of finite dependent clauses. In present-day English, there are two types of subjunctive, the present subjunctive and the past subjunctive. The present subjunctive consists of the base form of the verb used where the S form of the verb would normally occur. The present subjunctive can be used in that clauses like it is important that everyone register or the teacher insists that her students be on time. It also occurs in adverbial clauses. Here's an example. It will be a fantastic day whether it be sunny or cloudy. The past subjunctive uses the simple past to show hypothetical conditions, demands and wishes. Typical cases are seen in expressions like if I were you and James it's time you got married. Sometimes a subjunctive cannot clearly be recognized. In the examples, it is important that she try to study often and it is important that you try to study often. It is clear that the subjunctive form of you try remains unchanged whereas the subjunctive form she try differs from the normal simple present form she tries. Since the past subjunctive of be is where I was changes to I were as in if I were your girlfriend. The same is true for he she it whereas the subjunctive of the other personal pronouns are unnoticeable. Here you can only recognize the subjunctive from the context.