1. A friend is at your flat and suggests going out, but you can see rain outside.
=> I don't want to go out now. Look, it is raining outside.
2. A friend rings you up at work.
=> Sorry I can't talk now. I'm working.
3. You want to get off the bus, but the man next to you is sitting on your coat
=> Excuse me, I want to get off the bus but you are sitting on my coat ,could you stop sitting on it ,please?
4. A friend wants to talk to you, but you have just started to write an important letter
=> Can I talk to you later? I am writing an important letter.
5. You have been ill, but you're better now than you were.
=> I'm OK now, but I'm still ill.