This lesson provides an explanation of the key differences that will help you use “be going to” and “will” correctly.
"Will" expresses a desire or agreement to do something… or a sudden decision.
- I will help you with your homework.
- I will take your temperature.
"Be going to" is used when you already have plan to do something.
- I am going to have breakfast with Carrie.
When you want to make a prediction about the future, you can use "will" or "be going to". The meaning is the same.
- I will be famous someday/I am going to be famous someday.