go --> went --> gone
see --> saw --> seen
know --> knew --> known
meet --> met --> met
write --> wrote --> written
speak --> spoke --> spoken
send --> sent --> sent
do --> did --> done
eat --> ate --> eaten
drink --> drank --> drunk
sleep --> slept --> slept
sing --> sang --> sung

do => did => done
eat => ate => eat
drink => drank => drunk
sing => sang => sung

go --> went --> gone
see --> saw --> seen
know --> knew --> known
meet --> met --> met
write --> wrote --> written
speak --> spoke --> spoken
send --> sent --> sent
do --> did --> done

Past simple    past Perfect
 went               had gone
 saw                 had seen
 knew              had known
 met               had  met 
wrote             had written 
spoke               had spoken 
sent                 had sent
 did                had done
ate                 had eaten 
drank             had drunk
slept              had slept
sang              had sung