Formation of the subjunctive present is very simple. We take the 3rd person plural present and change -ant into -em, -ent into -eam, -unt into -am. The endings are same like in imperfectum indicativi after -ba-:
active voice : -m, -s, -t, -mus, -tis, -nt
passive voice : -r, -ris, -tur, -mur, -mini, -ntur
Examples :
I conjugation: voco, vocare, vocant:
person | singular | plural |
1 | vocem | vocemus |
2 | voces | vocetis |
3 | vocet | vocent |
II conjugation: video, videre, vident:
person | singular | plural |
1 | videam | videamus |
2 | videas | videatis |
3 | videat | videant |
In the IV conjugation the 3rd person plur. ends in -iunt :
person | singular | plural |
1 | veniam | veniamus |
2 | venias | veniatis |
3 | veniat | veniant |
III conjugation, regular verbs:
person | singular | plural |
1 | mittam | mittamus |
2 | mittas | mittatis |
3 | mittat | mittant |
III conjugation, verbs adding -i-:
person | singular | plural |
1 | faciam | faciamus |
2 | facias | faciatis |
3 | faciat | faciant |
The verb sum forms subjunctive present irregularly: sum > sim
person | singular | plural |
1 | sim | simus |
2 | sis | sitis |
3 | sit | sint |
Similarly : possum > possim, prosum > prosim, absum > absim.
Also verbs volo (velle), nolo, malo have similar irregular forms:
volo, velle, volunt > velim, velis, velit, velimus, velitis, velint
nolo, nolle, nolunt > nolim, nolis...
malo, malle, malunt > malim, malis...
The other verbs form futurum regularly :
eo, ire, eunt > eam, eas, eat, eamus, eatis, eant
abeo, abire, abeunt > abeam, abeas, abeat, abeamus, abeatis, abeant
fero, ferre, ferunt > feram, feras, ferat, feramus, feratis, ferant
fio, fieri, fiunt > fiam, fies...
The passive voice has regular passive endings :
Verbs in -em:
person | singular | plural |
1 | vocer | vocemur |
2 | voceris | vocemini |
3 | vocetur | vocentur |
Verbs in -am:
person | singular | plural |
1 | mittar | mittamur |
2 | mittaris | mittamini |
3 | mittatur | mittantur |