Most English verbs follow the same rule: the past tense is formed by adding -ed to the present form.
I called you but you didn't answer.
She booked us a table at the restaurant.
I accidentally closed the document I was working on.
Today we look at a few of the 180 irregular verbs which do not follow this rule.
We felt tired after our long walk. (past tense of feel)
Have you thought about buying a new car? (past participle of think)
This is the best report you have ever written. (past participle of write)
Now decide if the following sentences use a regular or irregular verb: