Category: Perfect group of Tenses
The Future Perfect tense
We use the Future Perfect to talk about an action that will be completed by a certain point in the future. Example: By the time you come back, I will have finished the report.
The Past Perfect tense
In the Past perfect tense, the auxiliary verb had is used with the past participle form of the verb to indicate that the action was completed before a past action or time.
The Present Perfect tense
The Present Perfect is often used to talk about actions that started in the past and have been completed at some point before the present moment.