The future progressive tense is formed by adding will be to the ing form (gerund form) of the main verb.
will be verb+ing
I will/'ll be watching TV.
I will not/won't be watching a football match.
Will you be watching TV?
will be watching = 'll be watching
will not be watching = won't be watching
Future progressive tense is used to indicate action which will be taking place at some time in the future.
I will be watching a football match next Sunday afternoon.
We'll be working on our project this morning..
When you arrive, I'll be sleeping .
I will be leaving in a few minutes.
We will be working tomorrow morning.