GOING TO + INF
to be + going to + inf
-prediction based on evidence
-intentions; plans
FUTURE SIMPLE
will + infinitive
-prediction based on your opinion
-spontaneous decisions or promises (usually contracted: ‘ll)
FUTURE CONTINUOUS
will be + verb + ing
-an activity in progress in the future; the stress is on the duration
PRESENT CONTINUOUS
-future arrangements (more than just a plan, you have already arranged things)
PRESENT SIMPLE
-fixed events in the future based on timetables, calendars and schedules (= ‘timetable future’)