Answer: Past perfect
The type of verb tense that is being used for an event that has been completed before the present moment in time or before something else occurs is called the past perfect tense. This verb tense is formed by the use of the verb "to have or to had" followed by a past participle form of the verb. An example of a sentence using the past perfect tense of the verb is as follows :
When I went to school yesterday, the teacher was already gone.
