Future

Basic rules

You use will-future when something most likely happen.
You use going to future when you made a decision to do this(it´s very probably) 
You use present progressive mostly for appointments/Dates.

Deeper explanation

How to form will-future?

The will-future is formed from the auxiliary-verb and the infinitive of the verb.

It is used in all forms will + infinitive also with he, she or it.[1]

For example:

positive:
I will go to toilet.
He/She/It will bake a cake. 

negative:
I won´t go to toilet.
He/She/It won´t bake a cake.

Questions:
Will you go to toilet?
Will he/she/it bake a cake?
     

How to form going-to future?

Going to-future will be from a form of (is, are, or is), going to and the infinitive of the verb.

To be (is, are, is) + going to + Infinitive. [2]

For example:

positive:

I´m going to use the restroom. He/She/It is going to bake a cake.

negative: I´m not going to bring you the toilet paper. He/She/It isn´t going to take the bus.

Questions: Are you going to bake a cake? Is he/she/it going to use the restroom?

How to form present progressive?

The ending engineer is suspended to the infinitive of the verb. Before the verb a form is used by to Be, so in, ares or is.3

positive: I´m flying to austrailia in the Holidays. Your dad is picking me up from school, tomorrow.

negative: She isn´t going to the beach without you. We aren´t going to School on the Weekend.

Questions: Are you making a trip with me next week? Is she baking a cake, next week?

Exercises

1.I am_____(to meet) my friend tomorrow.

2.He_____(positive)drink water.

3.I am_____(positive)bake a cake.

4.I _____(negative)take the bus.

5.You are_____(cut/negative)your hair yourself.

6.He is_______(negative) buy water.

7.____ he miss the train?

8.Are you______fly?

9.Is he_____(to go) to the party? 10.____he_____(to take) a shower later? 11.She is ____(negative) take the bus. 12.I_____(negative) do my homework. 13.Are you____ buy something. 14._____she get an Iphone? 15.She_______(to buy you an ice cream tomorrow morning? 16)_____she take the bus? O will O did O is 17)They are_____watch a movie