Regular verbs form the past tense by adding 'ed' to the basic form of the verb.
For example: work is the basic form
Adding 'ed' gives us: worked
The ending does not change with different pronouns.
I worked; he worked, we worked, you worked, they worked
There are three ways of pronouncing the 'ed' ending. Click on the link below to listen to the three ways!
Living English: Forming past tense with regular verbs