Saber subjunctive
Sepa sepamos
Sepas sepáis
Sepa sepan
Ser subjunctive
Sea seamos
Seas seáis
Sea sean
Ir
Vaya vayamos
Vayas Vayáis
Vaya vayan
Dar
Dé Demos
Des deis
Dé den
Estar
Esté Estemos
Estés Estéis
Esté Estén
Haber
Haya
Ar and er stem changers
Stem changers as in present
So no visitors or nosotros
Ir Stem changers
Present pattern
But no vosotros or nosotros
Ir verbs e-i
Present tense
All even nosotros and vosotros have stem changers
Verbs of hope formula
Verb of hope (present) + que + different subject + second verb in subjunctive
If there is no subject change use
Infinitive without que
What about ojalá?
Only one form
No conjugations
Always requires subjunctive