irregular verbs
verbs for which the three forms are written and/or pronounced differently
Here are some common irregular verbs:
have - had - had
go - went - gone
am/are/is - was/were - been
get - got - got
come - came - come
write - wrote - written
buy - bought - bought
catch - caught - caught
eat - ate - eaten
bring - brought - brought
begin - began - began
fall - fell - fallen
say - said - said
see - saw - seen
take - took - taken