Periodo ipotetico: how to use different tenses in the hypotetical phrases?

Hypotetical phrases are, even for Italian students, a tricky part of Italian language. Sometimes even politicians or doctors, after years of studying, get the wrong tense when saying the 'Se' prhase. When a student aks for help about this grammar rule, I would first examine their knowledge of the topic. How much do they know about the tenses: present and future indicative, imperfect subjunctive and present conditional, perfect subjunctive and past conditional. If there are problems with those, I would work with the student so that he/she is is fully confident with these tenses that constitute the basis, without which it becomes impossible to formulate correclty the hypotetical phrases.
Then, I would ask the student what he/she knows about the rule, how he/she has been taught it at school and what he/she understands and does not understand about it. There are many different ways to explain grammar, therefore I believe that starting from the student's knowledge and methods to which he/she is already used will make the process of learning esier. Finally, the best way to comprehend and master a grammar rule is through examples and exercises for each type of hypotetical phrase: reality, possibility, and impossbility. Very briefly:Reality: first and esiest type. It expresses a very probable, therefore real, action. In the Se clause: Present or Future Indicative. In the main clause: Present or Future Indicative. Example: Se studi (If you study), passerai l'esame (you'll pass the exam)Possibility: it expresses the possibility that something might happen. In the Se clause:  imperfect subjunctive. In the main clause: Present Conditional. Example: Se non fossi così pigra (If I wasn't this lazy), potrei fare molte più cose (I could do a lot more stuff)Impossibility: as the name says, it expresses an impossible condition. In the Se clause: past perfect subjunctive. In the main clause: Past conditional. Example: Se non fossi partita (If I hadn't left), non avei scoperto cose nuove (I wouldn't have discovered new things).