Future

Will future expresses a spontaneous decision, an assumption with regard to the future or an action in the future that cannot be influenced.

Form of will Future

Positive	Negative	Question
I will speak.	I will not speak.	Will I speak?
I’ll speak	I won’t speak	-----

Use of will Future

·         A spontaneous decisión. Example: Wait, I will help you.

·         An opinion, hope, uncertainty or assumption regarding the future. Example: He will probably come back tomorrow.

·         A promise. Example: I will not watch TV tonight.

·         An action in the future that cannot be influenced. Example: It will rain tomorrow.

·         Conditional clauses. Example: If I arrive late, I will call you.

Signal Words:
- In a year, next …, tomorrow
- Suposición: I think, probably, perhaps

(From: https://www.ego4u.com/en/cram-up/grammar/future-1-will)

Online exercises: 
Exercises 1
Exercises 2 (positive, negative, question)