Click here to listen to an explanation about the use of the present continuous and to be going to speak about future plans.
Be going to is used:
- for plans, intentions or ambitious we have for the future.
e.g. I'm going to expand my company.
-in predictions when there is evidence that something will happen in the future.
e.g Look at him! He's going to win the race.
Note: We use will when we make a prediction based on what we think, believe or imagine.
Present continuous is used:
-for fixed arrangements in the near future
I'm leaving to London in two days.
The present simple is used with a future meaning when we refer to programmes or timetables (trains, buses, etc.)