I have spent a lot of time trying to figure out what are subjunctive verbs.... below are my notes that might be useful for others:
Subjunctive - a statement contrary to fact, or expressing a wish, doubt, order, proposal. There are 2 cases
Case 1: The verb expresses a condition which is doubtful or not factual. In this case the use of subjunctive follow words such as if, as if, as though or wish.
Ex: I wish I were there.
He walks as though he were drunk.
We should start the meeting if Sam were here.
Case 2: The verb expresses an order, demand, request or proposal. In this case the subjunctive verb follows words such as important, imperative, intend, insist, demand, desire, direct, urgent, prefer.
The rule is Trigger word+that followed by a simple verb.
Ex: The boy knew it was imperative that he find a job quickly.
Would you please like to elaborate it a little more? Especially the part related to Trigger word?