She was going to come, but she had to stay home.
I'm going to Europe next month.
The plane leaves at 6:00 am.
You will be living in that house next month.
When you get home, I'll have finished cooking.
They are coming to have lunch tomorrow.
You will pass that exam. I tell you!
Personal PLANS, predictions based on present evidence.
Activities in PROGRESS at a future point in time (intentions and fixed events)
Timetables and scheduled events.
Action scheduled to happen in the past but didn't happen
Fixed arrangements we have made.
PREDICTIONS, facts, decisions made at the moment, offers, promises
Action completed BEFORE a particular time in the future.