This Tense is used to express an action which is imagined to began at some point of time in future and continue for sometime. It may be noted that this tense is basically theoretical and rarely used. In this tense the ‘ing’ form of the verb is used.
The formula for future perfect is Subject+Aux+Aux+Aux +V4
I will have been eating apples from next year.
We will have been eating apples from next year.
We will have been eating apples from next year.
You will have been eating apples from next year.
He will have been eating apples from next year.
She will have been eating apples from next year.
It will have been eating apples from next year.
They will have been eating apples from next year.