-WILL:
To make predictions or decisions that are made at the moment of speaking.
Is used to with the expressions: I think, I believe, I'm sure...
Ex: Do you think she will come soon?
-GOING TO:
To make predictions based on evidence. Intentions, plans, where the decision has been made before the moment of speaking.
Ex: They are going to drive to come today.
-PRESENT CONTINUOUS:
To talk about future arrangements.
Ex: They are coming to see us tomorrow.
-PRESENT SIMPLE:
To refer to future events that are schedule.
Ex: The train leaves at 6:00 pm.
On the other hand, we can difference two types of futures:
-FUTURE PERFECT SIMPLE:
To events or actions from a point in the future after we expect the event or action to have already finished.
Will have+ past participle
Ex: I will have passed my driving test by the end of the year.
-FUTURE PERFECT CONTINUOUS:
Talk about an activity that will be in progress at a specific time in the future.
Will+be+verb-ing
Ex: My family will be visiting my grandmother.
