be - was/were - been
do - did -done
travel - traveled - traveled
look - looked - looked
have - had - had
meet - met - met
visit - visited - visited
eat - ate - eaten
go - went - gone
come - came - come
build - built - built
fly - flew - flown
take - took - taken
hear - heard - heard
play - played- played
watch - watched - watched
know - knew - known
learn - learned - learnt
study - studied - studied
make - made - made
try - tried - tried
read - read - read
teach - taught - taught