Past Tense
go
have gone
swim
have swum
Simple Past of bring
drank
see
have seen
sing
have sung
Past Participle of teach
have taught
fly
flew
begin
become
have become
have drunk
Past Participle of bet
have bet
ring
throw
have thrown
know
have known
Simple Past of find
found
sting
stung
be
have sworn
be
have been