1. Can I turn the TV on?
Sorry, you can't, because I'm doing my homework and I need silence.
2. Can I borrow your Engilsh dictionary?
Sorry, you can't because I'm using it now.
3. Can I sit there?
Sorry, you cant, because it's already taken.
4. Can I smoke in your room?
Sorry, you can't. My mum doesn't know, that you smoke, and she'll be angry.
5. Can I swim in your pool?
Sorry, you can't. No one besides us is in here.