Here are some examples:
Common Irregular Verbs:
* Be: am/is/are → was/were
* Have: have/has → had
* Do: do/does → did
* Go: go → went
* See: see → saw
* Say: say → said
* Come: come → came
* Eat: eat → ate
* Give: give → gave
* Take: take → took
* Make: make → made
* Know: know → knew
* Get: get → got
* Think: think → thought
Other Irregular Verbs:
* Become: become → became
* Begin: begin → began
* Break: break → broke
* Bring: bring → brought
* Buy: buy → bought
* Catch: catch → caught
* Choose: choose → chose
* Cut: cut → cut
* Fall: fall → fell
* Find: find → found
* Fly: fly → flew
* Forget: forget → forgot
* Forgive: forgive → forgave
* Freeze: freeze → froze
* Hear: hear → heard
* Hold: hold → held
* Hurt: hurt → hurt
* Keep: keep → kept
* Leave: leave → left
* Lose: lose → lost
* Mean: mean → meant
* Pay: pay → paid
* Read: read → read
* Ride: ride → rode
* Ring: ring → rang
* Run: run → ran
* Sing: sing → sang
* Sleep: sleep → slept
* Speak: speak → spoke
* Spend: spend → spent
* Stand: stand → stood
* Steal: steal → stole
* Swim: swim → swam
* Swing: swing → swung
* Teach: teach → taught
* Tell: tell → told
* Think: think → thought
* Throw: throw → threw
* Understand: understand → understood
* Wake: wake → woke
* Wear: wear → wore
* Win: win → won
* Write: write → wrote
Important Note: There are some verbs that are considered "regular" but have irregular past forms due to pronunciation changes. For example, "learn" becomes "learned", and "smell" becomes "smelled" but are pronounced with a silent "e".
This list is not exhaustive. There are many other irregular verbs in English. However, it should give you a good starting point.