Irregular verbs are verbs that do not follow the usual pattern of adding "-ed" to form the past tense. Instead, they change forms in their past tense and past participle. Here are some common irregular verbs and their forms:
Be - Was/Were - Been
Become - Became - Become
Begin - Began - Begun
Break - Broke - Broken
Bring - Brought - Brought
Build - Built - Built
Buy - Bought - Bought
Catch - Caught - Caught
Choose - Chose - Chosen
Come - Came - Come
Cut - Cut - Cut
Drink - Drank - Drunk
Drive - Drove - Driven
Eat - Ate - Eaten
Fall - Fell - Fallen
Feel - Felt - Felt
Hear - Heard - Heard
Hold - Held - Held
Leave - Left - Left
Meet - Met - Met
You need to memorize these forms, as there is no specific rule for how they change. Some verbs may also have the same past tense and past participle forms, like "put," which remains "put." Use these verbs in conversation or writing by knowing their past forms.