FUTURE

"Will" is an auxiliary verb that we use to indicate a certain future, and "going to" is used only to express an intention for the future.

 
Briefly, we use will for something that will make with certainty. For example: 

• He will study this essay this afternoon

The Will structure is the following one:
 

Subject + Will + Verb

Here are some examples in its affirmative form:

• I will study this night
• She will drive to her best friend's house
• He will learn English because reading this blog

Examples in its negative form (as an auxiliar we can use will not or won't):

• I will not cook for you tonight
• She won't learn French in that country
• He won't drink alcohol in the party

Examples in the interrogative form (the auxiliar will is prefixed to the interrogogative particle):

• Will you dance this night?
• Where Will he meet his sister?
• Will she meet with me?

 

The "going to" future is used to express activities in the immediate future, in many cases it is used informally as "gonna", for example:

• I am going to run tomorrow in the race
• I am gonna run tomorrow in the race

Examples in its affirmative form:

• They are going to walk tonight
• She is going to run tomorrow morning

In its negative form:

• They are not going to eat
• She is not going to do the exam

In its interrogative form:

• Are we going to study in a few minutes?
• Is she going to dance tomorrow?