The Future -Going to

There is no one 'future tense' in English. There are 4
future forms. The one which is used most often in spoken English is
'going to', not 'will'.

We use 'going to' when we want to talk about a plan for the future.

• 
  I'm going to see him later today.
  
• 
  They're going to launch it next month.
  
• 
  We're going to have lunch first.
  
• 
  She's going to see what she can do.
  
• 
  I'm not going to talk for very long.
  

Notice that this plan does not have to be for the near future.

• 
  When I retire I'm going to go back to Barbados to live.
  
• 
  In ten years time, I'm going to be boss of my own successful company.
  

We use 'going to' when we want to make a prediction based on evidence we can see now.

• 
  Look out! That cup is going to fall off.
  
• 
  Look at those black clouds. It's going to rain soon.
  
• 
  These figures are really bad. We're going to make a loss.
  
• 
  You look very tired. You're going to need to stop soon.
  

We can replace 'going to go' by 'going'.

• 
  I'm going out later.
  
• 
  She's going to the exhibition tomorrow.