I use this PowerPoint to introduce the Subjunctive:
It starts with 3 slides of examples where I elicit the English.
Then it explains that:
The subjunctive is not a tense, but an alternative form of the verb which has to be used in certain circumstances.
The next slide states:
Grammar books usually refer to it as the subjunctive mood as it often conveys a particular mood e.g. sadness, joy, anger, doubt, uncertainty.
The following slide elicits the formation for regular verbs and the final slide introduces the je form of key irregular verbs. The students must match up the infinitive and the je form.