we use present continuous to talk about decisions made at the moment of speaking
we use present simple to talk about decisions made before the moment os speaking
we use going on to talk about plans anad arrangements
we use will to predict future events based on what we know or believe
we use going to to predict future events based on what we can hear or see
now
we use present simple when we are talking about timetables
we use present simple after some time phrases
I have a holiday in Antarctica next month
He's going to go on a working holiday next year
Look at the sky,it's going to snow today!
In the next few years,the sea level will rise faster and faster.
Would you like a drink? Oh yes ,I'll have water with ice,please!
The next tour boat leaves at 10 a.m next monday
