stem=infinitive
Add the following endings to -AR, -ER and -IR infinitives:
é emos
ás
á án
12 irregular stems (same irregular stems as for the Conditional tense):
decir dir-
hacer har-
querer querr-
caber cabr-
saber sabr-
haber habr-
poner pondr-
poder podr-
venir vendr-
salir saldr-
tener tendr-
valer valdr-