1. Subjunctive Formation

2. The Process Take your infinitive “hablar”
Change to the “yo” form –hablo
Remove the “o” from hablohabl-
Add the opposite ending, ar verb  er ending
Hable, Hables, Hable, Hablemos, Hablen

3. ER Take your infinitive “comer” Change to the “yo” form –como
Remove the “o” from comocom-
Add the opposite ending, er verb  ar ending
Coma, Comas, Coma, Comamos, Coman

4. IR Take your infinitive “Vivir” Change to the “yo” form –vivo
Remove the “o” from vivoviv-
Add the opposite ending “IR” verb  “AR” ending
Viva, Vivas, Viva, Vivamos, Vivan

5. Why the “yo” form?
If there is an irregularity in the yo form, there will be an irregularity in the subjunctive
Tener Tengo Teng-
Tenga, Tengas, Tenga, Tengamos, Tengan

6. How about if you have a verb like “Salir”?
Salir Salgo
SalgoSalg-
Salga, Salgas, Salga, Salgamos, Salgan

7. Try this one out on your own!
Decir Digo
What are the five forms of the subjunctive?
Diga, Digas, Diga, Digamos, Digan

8. Of course there are also straight up irregular ones as well!
Ser Sea, Seas, Sea, Seamos, Sean
Ir Vaya, Vayas, Vaya, Vayamos, Vayan

9. Have you seen this before?
Absolutely, they are the same as the Commands*