Future Perfect

The future perfect tense is only used in a few situations, but it's still good to know it. Here's how to make it.

The future perfect is made with the future simple of 'have' (will have) and the past participle. For regular past participles add 'ed' to the verb ('play' becomes 'played').

Here's the positive:
By six pm tonight: I will have finished this book. You will have studied the English tenses and
She will have cooked dinner

For the short form, we change will to 'll. But, when we are speaking, we also make 'have' shorter, so it sounds like I'll've finished (don't write this!).

I'll have finished this book
You'll have studied the English tenses
Here's the negative:

By next week,
I will not have finished this book. You will not have studied the English tenses. She will not have cooked dinner

Here's the short form.
I won't have finished this book
You won't have studied the English tenses
To make the question, just put 'will' before the subject:

'Yes / no' questions:
By next year,
Will I have finished writing this book?
Will you have studied all the English verb tenses?
Will she have graduated?
'Wh' questions:
When will I have finished writing this book?
Why will you have studied all the English verb tenses by tomorrow?
When will she have been here three weeks?

taken from:
http://www.perfect-english-grammar.com/future-perfect.html