1. I am tied up.
我有事走不開。
2. I can't make it at that time.
我脫不開身啊。
3. You see I'm in the middle of something.
你看,我正忙著呢。
4. I'm sorry, I'm otherwise engaged.
對不起,我有其他安排了。
5. I have other fish to fry.
我還有別的事要做。
6. I am in a meeting. I'll call you later.
在開會呢,過會兒打給你。
7. Sorry, I have plans.
對不起,我有事。
8. I'd love to,but I am busy.
我想,但是我很忙。