venir
vien- s/s/t/venons/venez/nent
souffrir
souff- re/res/re/rons/rez/rent
mourir
meur- s/s/t/mourons/mourez/rent
devenir
devien- s/s/t/devenons/devenez/nent
sortir
sor- s/s/t/tons/tez/tent
courir
cour- s/s/t/ons/ez/ent
partir
par- s/s/t/tons/tez/tent
dormir
dor- s/s/t/mons/mez/ment
sentir
sen- s/s/tons/tez/tent
couvrir
couvr- e/es/e/ons/ez/ent
offrir
offr- e/es/e/ons/ez/ent