We use these forms:
to talk about the present:
He works at McDonald’s. He has worked there for three months now.
He is working at McDonald’s. He has been working there for three months now.
London is the capital of Britain.
to talk about the future:
The next train leaves this evening at 1700 hours.
I’ll phone you when I get home.
He’s meeting Peter in town this afternoon.
I’ll come home as soon as I have finished work.
You will be tired out after you have been working all night.
We can use the present tenses to talk about the past...