Imagine that a friend has just invited you to meet him / her for coffee after school. Accept the invitation, including these elements: 1. a positive reaction (like 'great' or 'okay')
2. you'd love to go, but only for a while
3. you're exhausted
4. you want to go home and relax
5. you don't want to be a party pooper
6. propose a time to meet
7. tell him/her you'll see each other later