Not all verbs add -ed to make the past tense. Some verbs change one letter of the present tense verb to make a past tense verb. Look at these examples:
Today I know my ABCs. Yesterday I knew my ABCs.
Today I swim in my pool. Yesterday I swam in my pool.
Every summer I grow a vegetable garden. Last year I grew a vegetable garden.
Here are more verbs that change one letter of the present tense to make a past tense verb:
get – got
lose – lost
meet – met
ride – rode
run – ran
sit -sat
ring – rang
Some present tense verbs change one letter to become past tense.
▶It’s your turn. Rewrite this sentence with the past tense form of the verb. I sit in a chair. Did you change one letter in the verb to make it past tense? Good for you!