Will vs Going To
Will = spontaneous decision; going to = prior plan.
Examples
- The phone's ringing. I'll get it.
- I'm going to visit Rome.
Key rules
- will is for sudden decisions made while speaking
- going to is for plans made before speaking
- going to is also for predictions based on present evidence
- will is for general predictions and promises
Common mistakes
- I will meet him tomorrow at 6 (already arranged) โ I'm going to meet him tomorrow
- Look, it will rain โ Look, it is going to rain
๐ก Tip: Ask: was the plan made before now? If yes, use going to.