1. the action is taking place at the time speaking.
- It's raining.
- Who is Lisa talking to on the phone?
- Look, somebody is trying to steal that woman's wallet.
2. the action is true at the present time, but we don't think it will be true in a long term.
- I'm looking for a new flat.
- He's thinking about leaving his job.
- Are you getting enough sleep?
3. the action is at a definite point in the future and it has already been arranged.
- I'm meeting him at 6.30.
- They aren't arriving until Sunday.
- Isn't she coming to the dinner?
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