- When something is fixed for the future, or in the diary we use to be +ing: I'm talking about the future at 3pm tomorrow. I'm getting married on the 10th of June.
- For making predictions, promises or immediate decisions we use will + infinitive: It will be fun. I won't be late for my lesson. Wait a minute, I'll make some coffee.
- For intentions - something we are planning now about the future - we use going to + infinitive: I'm going to ask questions. I'm going to watch Casablanca tonight.
- If there is a lot of doubt, might + infinitive is best: Students might be unsure about the grammar. I might go to England or America on holiday.
Well done. Now, I'm going to go to bed...