The endings of prasens passivi are the following:

person	singular	plural
1	-or	-mur
2	-ris	-mini
3	-tur	-ntur

We can form the 1st person from the 1st person activi, simply adding -r (vocor, videor, mittor, capior, audior). The 2nd person singular can be formed from infinitivus activi, changing -re into -ris. The 3rd person plural changes the active -nt into -ntur. For the other forms, we should remove -s from the 2nd person sing. activi and add -tur (3 sg.), -mur (1 pl.), -mini (2 pl.). I conjugation:

person	singular	plural
1	vocor	vocamur
2	vocaris	vocamini
3	vocatur	vocantur

II conjugation:

person	singular	plural
1	videor	videmur
2	videris	videmini
3	videtur	videntur

In the IV conjugation the 3rd person plur. ends in -iunt :

person	singular	plural
1	audior	audimur
2	audiris	audimini
3	auditur	audiuntur

The III conjugation:

person	singular	plural
1	mittor	mittimur
2	mitteris	mittimini
3	mittitur	mittuntur

III conjugation, verbs adding -i-:

person	singular	plural
1	capior	capimur
2	caperis	capimini
3	capitur	capiuntur

The passive of facio, facere is fio, fieri, with active conjugation (fio, fis, fit, fimus, fitis, fiunt). The verbs sum, volo, nolo, malo do not have passive voice. Ire can have 3rd person passive (itur), some of verbs in -eo, -ire can have full regular passive voice (transire : transeor, transiris, transitur, transimur, transimini, transeuntur). Also fero, ferre can have passive voice. Then 3 person passive is "fertur" (the whole passive: feror, ferris, fertur, ferimur, ferimini, feruntur).