Verbs with coalescence of consonants

Many verbs derive from Germanic strong verbs, which make many of their inflected forms through vowel gradation, as can be observed in Modern English patterns.

Some of these verbs have alternative regular forms, such as WEDDED and WETTED. (The verb hoist behaves similarly to verbs in this group, but this was originally itself a past form of the now obsolete verb hoise; similarly clad was originally – and sometimes still is – a past form of clothe.)

Verb	Past	Past Participle
bet	bet	bet
bid	bid	bid
cast	cast	cast
cost	cost	cost
cut	cut	cut
fit	fit	fit
hit	hit	hit
hurt	hurt	hurt
knit	knit	knit
put	put	put
quit	quit	quit
rid	rid	rid
set	set	set
shed	shed	shed
shut	shut	shut
split	split	split
spread	spread	spread
thrust	thrust	thrust
wed	wed	wed
wet	wet	wet

To find the correct form, you can use an online database of the irregular verbs.

For example: irregular verb COST