past tense endings for -ar
I- é
you- aste
s/he- ó
we- amos
you pl- asteis
they- aron
past tense endings -er
I- í
you- iste
s/he- ió
we- imos
you pl- isteis
they- ieron
past tense endings - ir
I- í
you- iste
s/he- ió
we- imos
you pl- isteis
they- ieron