Will

We form the will-future with the auxiliary will and the infinitive of the verb.

Ex:

(Affirmative)
He will play football.
He'll play football.

(Negative)
He will not play football.
He won't play football.
He'll not play football.

(Questions)
Will he play football?

We use will when future actions happen without the speaker's intention (birthday, weather, etc.), for predictions, assumptions (I think, I hope, I'm sure, I'm afraid) and for Ssontaneous actions (not planned).

Ex:
The sun will shine tomorrow.
Peter will be 15 next Tuesday.
I think Sue will arrive in Paris at 6 pm.
Hang on! I'll have a word with you.

Credits: Will