Why is this phrase considered to be a phrase containing a regular verb? "Some athletes have taken drug tests to prove they are not on steroids."
Regular and Irregular Verbs
To make the past tence or past participle form of most verbs(regular verbs) you simply add "ed" at the end.
Ex. Using the verb Walk
Past Tense: I walked through the maze.
Past Participle: I have walked through the maze.
Irregular verbs aren't that simple, here is an example of one.
Past tense: We saw the secret maps.
Past Participle: We have seen the secret maps.