Pronouns + won´t + verb infinitive+ complement
Will they bring more people?
You're not going to study for the exam on friday.
He is going to visit his brother tomorrow.
Going to
It is generally used to talk about plans or intentions and premeditated decisions to be made in the future.
Will
Pronoun + won´t + verb infinitive+ complement
Pronoun + to be not+ going to + verb infinitive+ complement
Will it stop raining by tomorrow?
He won’t eat all the food.
It is used to talk about the future. It is generally used to talk about spontaneous decisions or events that could happen in the future.
Pronoun+ to be+ going to + verb infinitive + complement