do
did - done - hacer
sting
stung - stung - picar (insectos)
learn
learned - learned - aprender
eat
ate - eaten - comer
like
liked - liked - gustar
be
was/were - been - ser/ estar
have
had - had - tener
cut
cut - cut - cortar
travel
travelled - travelled - viajar
discover
discovered - discovered - descubrir