Unit 4. Present tenses. I am doing (I do with a future meaning).
with a future meaning
Study this example situation:
This is Tom’s schedule for next week.
He is playing tennis on Monday afternoon. He is going to the dentist on Tuesday morning. He is having dinner with Ann on Friday.
In all these examples, Tom has already decided and arranged to do these things.
When you are talking about what you have already arranged to do, use the present continuous (I am doing). Do not use the simple present (I do).
A: What are you doing tomorrow evening? (not what do you do)
B: I’m going to the theater, (not I go)
A: Are you playing tennis tomorrow?
B: Yes, but Tom isn’t playing. He hurt his leg.
A: Ann is coming tomorrow.
B: Oh, is she? What time is she arriving?
A: At 10:15.
B: Are you meeting her at the station?
A: I can’t. I’m working tomorrow morning.
It is also possible to use going to (do) in these sentences:
What are you going to do tomorrow evening?
Tom is going to play tennis on Monday afternoon.
But the present continuous is usually more natural when you are talking about arrangements. See also Unit 5.
Do not use will to talk about what you have already arranged to do:
What are you doing this evening? (not what will you do)
Alex is getting married next month, (not Alex will get)
For will see Units 6 and 7.
B. Simple present with a future meaning
We use the simple present when we are talking about timetables, schedules, etc. (for example, public transportation, movies):
What time does the movie begin?
The train leaves Boston at 7:25 a.m. and arrives in Washington, D.C., at 3:41p.m.
The football game starts at 2:00.
Tomorrow is Wednesday.
But we do not usually use the simple present for personal arrangements:
What time are you meeting Ann? (not do you meet)