Verbs simple aspect Continuous(progressive) aspect Perfect and Perfect Continuous aspect

Future Perfect Simple and Continuous
To talk about the past from a point in the future. It is the equivalent of the present perfect with the reference point in the future. The present perfect looks back from now: the future perfect looks back from the future.
FORM
Future perfect simple: will have + past participle:
I’ll have finished, etc.
Future perfect continuous: will have been + present participle:
I’ll have been working, etc.
USE

• 
  We use the future perfect simple to say that, at a certain time in the future, something will be completed and be in the past. It is often used with by + time reference:
  

I’ll have finished this book by tomorrow.
I’ll have told him the news bv the time you set here.

• 
  We use the future perfect simple and continuous with for to talk about the duration of an activity or state up to a time in the future: