There are two diferent class of verbs in english:

Regular : these verbs are caracterized because they all finish in ed in the past simple and in the past participle.

Example:

Infinitive	Past simple	Past participle
add	added	added
acept	acepted	acepted
play	played	played

Irregular: these verbs are caracterized because they are totaly diferent in all the times infinitive, past simple, and past participle:

List:

Present	Past	Past Participle
be	was, were	been
become	became	become
begin	began	begun
blow	blew	blown
break	broke	broken
bring	brought	brought
build	built	built
burst	burst	burst
buy	bought	bought
burst	burst	burst
catch	caught	caught
choose	chose	chosen
come	came	come
cut	cut	cut
deal	dealt	dealt
do	did	done
drink	drank	drunk
drive	drove	driven
eat	ate	eaten
fall	fell	fallen
feed	fed	fed
feel	felt	felt
fight	fought	fought
find	found	found
fly	flew	flown
forbid	forbade	forbidden
forget	forgot	forgotten
forgive	forgave	forgiven
freeze	froze	frozen
get	got	gotten
give	gave	given
go	went	gone
grow	grew	grown
have	had	had
hear	heard	heard
hide	hid	hidden
hold	held	held
hurt	hurt	hurt
keep	kept	kept
know	knew	known
lay	laid	laid
lead	led	led
leave	left	left
let	let	let
lie	lay	lain
lose	lost	lost
make	made	made
meet	met	met
pay	paid	paid
quit	quit	quit
read	read	read
ride	rode	ridden
run	ran	run
say	said	said
see	saw	seen
seek	sought	sought
sell	sold	sold
send	sent	sent
shake	shook	shaken
shine	shone	shone
sing	sang	sung
sit	sat	sat
sleep	slept	slept
speak	spoke	spoken
spend	spent	spent
spring	sprang	sprung
stand	stood	stood
steal	stole	stolen
swim	swam	swum
swing	swung	swung
take	took	taken
teach	taught	taught
tear	tore	torn
tell	told	told
think	thought	thought
throw	threw	thrown
understand	understood	understood
wake	woke (waked)	woken (waked)
wear	wore	worn
win	won	won
write	wrote	written