The future perfect tense of the verb indicates an action that will be completed before another future action occurs.

It is formed by adding will have/shall have before the past participle of the verb.

By the time the year ends, every school shall have acquired its own computer.

The computer programmer will have fixed the CPUs before the supervisor arrives.

Before the sun rises, the early morning television show shall have begun.

Expressions like before and by the time followed by the simple present tense usually precede or follow the future perfect tense.