Irregular Verbs (Appendix): For most verbs in English, one needs to know three basic forms in order to make all tenses. These are the simple form, the simple past form, and the past participle. The following is a partial list of irregular verbs

simple form
simple past
participle
be
was, were
been
become
became
became
begin began begun
bend bent bent
bite bit bitten
blow blew blown
break broke broken
bring brought brought
broadcast broadcast broadcast
build built built
buy bought bought
catch caught caught
choose chose chosen
come came come
cost cost cost
cut cut cut
dig dug dug
do did done
draw drew drawn
drink drank drunk
drive drove driven
eat ate eaten
fall fell fallen
feed fed fed
feel felt felt
fight fought fought
find found found
fit fit fit
fly flew flown
forget forgot forgotten
forgive forgave forgiven
freeze froze frozen
get got gotten (got)
give gave given
go went gone
grow grew grown
hang hung hung
have had had
hear heard heard
hide hid hidden
hit hit hit
hold held held
hurt hurt hurt
keep kept kept
know knew known
lay laid laid
lead led led
leave left left
lend lent lent
let let let
lie lay lain
light lit (lighted) lit (lighted)
lose lost lost
make made made
mean meant meant
meet met met
pay paid paid
put put put
quit quit quit
read read read
ride rode ridden
ring rang rung
rise rose risen
run ran run
say said said
see saw seen
sell sold sold
send sent sent
set set set
shake shook shaken
shoot shot shot
shut shut shut
sing sang sung
sit sat sat
sleep slept slept
slide slid slid
speak spoke spoken
spend spent spent
spread spread spread
stand stood stood
steal stole stolen
stick stuck stuck
strike struck struck
swear swore sworn
sweep swept swept
swim swam swum
take took taken
teach taught taught
tear tore torn
tell told told
think thought thought
throw threw thrown
understand understood understood
upset upset upset
wake woke waked (woken)
wear wore worn
win won won
withdraw withdrew withdrawn
write wrote written
burn burned (burnt) burned (burnt)