Formation of the subjunctive imperfect is very simple: We add to the infitive the subjunctive endings: 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	vocarem	vocaremus
2	vocares	vocaretis
3	vocaret	vocarent

II conjugation: video, videre, vident:

person	singular	plural
1	viderem	videremus
2	videres	videretis
3	videret	viderent

In the IV conjugation: venio, venire:

person	singular	plural
1	venirem	veniremus
2	venires	veniretis
3	veniret	venirent

III conjugation, regular verbs:

person	singular	plural
1	mitterem	mitteremus
2	mitteres	mitteretis
3	mitteret	mitterent

III conjugation:

person	singular	plural
1	facerem	faceremus
2	faceres	faceretis
3	faceret	facerent

The verb sum, esse :

person	singular	plural
1	essem	essemus
2	esses	essetis
3	esset	essent

The other verbs are also regular : posse > possem, abesse > abessem, velle > vellem, nolle > nollem, malle > mallem, ire > irem, abire > abirem, ferre > ferrem. A sort of exception is fieri : fierem. The passive voice has regular passive endings :

person	singular	plural
1	vocarer	vocaremur
2	vocareris	vocaremini
3	vocaretur	vocarentur