Know - knew -known

hide-hid-hidden

eat-ate-eaten

drop-dropped-dropped

catch-caught-caught

begin-began-begun

break-broke-broken

fly-flew-flown

forget-forgot-forgotten

try-tried-tried

wear-wore-worn

understand-undrestood-undrestood

say-said-said

ring-rang-rung

clap-clapped-clapped