To form the past tense with regular verbs we use the base form of the verb and add the ending “-ed”.
We cannot use the ending “-ed” with irregular verbs. They follow a different conjugation table.
eat (ate), begin (began), break (broke), buy (bought), drive (drove), go (went), know (knew), leave (left), make (made)
I ate a hamburger yesterday.
He drove home last night.
We went to the game last week.
She knew him from earlier.
I left after lunch.
You made a mistake.