to be - ser, estar
is/are- was/were - been
to have - tener
have/has - had - had
can - poder
can - could
to have to - tener que
has/have to - had to - had to
to say - decir
say/says - said - said
to do - hacer
do/does - did - done
to give - dar
give/gives - gave - given
to come - venir
come/comes - came - come
to write - escribir
write/writes - wrote - written
to study - estudiar
study/studies - studied - studied
to make - hacer
make/makes - made - made
should - deber
should - should
to want - querer
want/wants - wanted - wanted
to go - ir
go/goes - went - gone
to eat - comer
eat/eats - ate - eaten
