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Irregular Forms
Not all verbs form their past tenses regularly. Some verbs change forms radically changing tenses. 

For example, the simple form of blow,  forms it's past tense by changing the vowel to become  blew.

Some of the Most Common Irregular Verbs are:

Simple Form  

Past Tense  

Past Participle

awake

awoke

awakened

be

was, were

been

blow

blew

blown

* cut

cut

cut

do

did

done

draw

drew

drawn

fly

flew

flown

get

got

gotten

have 

had

had

go

went

gone

* hit

hit

hit

hold

held

held

know

knew

known

* let

let

let

say

said

said

ride

rode

ridden

speak

spoke

spoken

sit

sat

sat

swim

swam

swum

take

took

taken

* asterisked forms do not change form at all.