PRESENT SIMPLE
We use the Present Simple for timetables, programmes, trains, buses etc.:
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The train leaves at 7 o’clock.
What time does the film finish?
The meeting is at 5 p.m.
PRESENT CONTINUOUS
I am doing something tomorrow = I have arranged to do it, I have a plan to do it.
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Alice is going to the dentist on Friday. (= she has an appointment to see the dentist)
What are you doing tomorrow? (= what have you arranged to do?)
GOING TO
1. I'm going to do something = I have decided to do it, my intention is to do it.
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Sue and I have decided to have a party. We're going to invite lots of people. (It is our intention to do
so)
2. When the situation makes us believe that 'something' is going to happen.
EVIDENCE. CLUES
The woman is walking towards the hole, so she is going to fall into it.
WILL
1. For predictions: I don't think it will rain this afternoon.
2. When you offer or decide to do something on the spur of the moment/ now
A: Let's have a party. B: Great idea! We'll invite lots of people.
3. First conditional
If I pass the exam, my mum will buy me a PS5
Compare:
• 'George phoned while you were out' 'OK. I'll phone him back' (=decision now)
'George phoned while you were out' 'Yes, I know. I'm going to phone him back' (= decision before)
• 'Ann is in hospital' 'Oh really? I didn't know. I'll go and visit her' (=decision now)
'Ann is in hospital' 'Yes, I know. I'm going to visit her tomorrow' (= decision before)