In the simple past, there are many verbs that have irregular conjugations.  Below, they are grouped to help you to memorize them:

Group: (same)

hit > hit

fit > fit

quit > quit

spit > spit

split > split

slit > slit

hurt > hurt

read > read (pronunciation)

spread > spread

shed > shed

shut > shut

cut > cut

put > put

beat > beat

cost > cost

bet > bet

let > let

rid > rid

bid > bid

set > set

thrust > thrust

upset > upset

 

Group: -ought, -aught

buy > bought

bring > brought

teach > taught

catch > caught

fight > fought

think > thought

seek > sought

 

Group: -ung

sling > slung

sting > stung

cling > clung

swing > swung

wring > wrung

fling > flung

 

Group: -ound

wind > wound

find > found

grind > ground

bind > bound

 

Group:   –in-, –an-, –un-

swim > swam

drink > drank

sing > sang

ring > rang

begin > began

shrink > shrank

sink > sank

stink > stank

 

Group: -ew

blow > blew

draw > drew

fly > flew

grow > grew

know > knew

throw > threw

 

Group: -o_e

write > wrote

freeze > froze

ride > rode

sell > sold

steal > stole

rise > rose

 

speak > spoke

wake > woke

break > broke

 

Group: -ept

creep > crept

sleep > slept

keep > kept

weep > wept

sweep > swept

 

Group: remove 2nd vowel

breed > bred

bleed > bled

feed > fed

lead > led

plead > pled

speed > sped

meet > met

shoot > shot

 

Group: -aid

pay > paid

say > said

lay > laid

 

Group: d > t

bend > bent

lend > lent

send > sent

spend > spent

 

Group: +t, +d

build > built

hear > heard

mean > meant

 

Group: Super Irregulars

be > was/were

do > did

go > went

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