Will versus Be going to

I'm going to the beach next weekend with my friends.

Maybe England will win the next World Cup.

That looks very heavy. I'll help you!

I'm going to go to the cinema with Martha this afternoon.

Tomorrow the sun will rise at 6:52 AM.

I believe we will wear masks in 2022.

I'm thirsty. I think I'll buy a drink.

There is a banana peel on the floor. He's going to fall down!!

Don't worry, I won't tell anyone.

Plans and intentions

Prediction based on personal opinion

Promises

Predictions based on personal opinion.

Future facts

Decisions made at the moment of speaking

Rapid decisions or decisions made at the moment of speaking

Predictions with evidence.

Plans and intentions