01.03.03 拒绝邀请
1. I'm not sure about it. I'll have to check.
2. I'll be busy all day long.
3. I won't be free until Wednesday.
4. Any time except this Sunday.
5. I have to work overtime tonight.
6. I'll have to attend a conference that day.
7. I'd love to, but I couldn't.
8. I don't feel well.