What are perfect verb tenses?

Answer 1

The perfect tense is used to describe an action which has occurred solely in the past and has been completed. For example I ate sausage. "I ate" is a completed action.

Compare this with I was eating sausage when the door bell sounded.

I was eating is in the imperfect tense because the action was continuing in the past but was unfinished when something else occured.

Answer 2

Perfect verb tenses indicate completion of an action or state at a specific point in time. They are formed with the auxiliary verb "have" followed by the past participle of the main verb, such as "has danced," "had talked," or "will have read." Examples include present perfect ("has written"), past perfect ("had seen"), and future perfect ("will have finished").