Future simple and be going to

Future simple

Be going to

uses

-a prediction

-A timetable

A spontaneous decision

Affirmative

subject+will+base form

Negative

subject+won´t+ base form

Interrogative

will+subject+base form

uses

- A planned action for the future

-An action that is about to happen

Affirmative

Subject+am/is/are+going to+base form

Negative

subject+am not/isn´t/aren´t+going to+base form

Interrogative

am/is/are+subject+going to+base form