To build the future simple tense we use the auxiliary verb "will" and the base form of the main verb:
will + infinitive
|Positive and negative|
will (= 'll)
will not (= won't)
I will be busy tomorrow.
You won't eat it.
It will probably rain in the afternoon.
Will they help us?
I will = I shall, we will = we shall
We can say "I shall" or "we shall". It is the same as "will". Note that we do not use "shall" with other persons: you/he/she/it/they will.
I shall be hungry by two o'clock. = I will be hungry by two o'clock.
We shall always be together. = We will always be together.
Jason will go on holiday in summer.
We can give short answers to "yes/no" questions:
Yes, I will.
No, I won't.
— Will George come to the party? — Yes, he will.
— Will you be late? — No, I won't.