1. You see I'm in the middle of something.
你看,我正忙着呢。
2. I can't make it at that time.
我那个时候脱不开身啊。
3. I am tied up.
我有事走不开。
4. Sorry, I'm otherwise engaged.
对不起,我有其他安排了。
5. I have other fish to fry.
我还有别的事要办。
6. I am in a meeting. I'll call you later.
我正在开会呢,过会儿打给你。
7. I'd love to go to this party, but I have plans tonight.
我很想去参加这个聚会,但今晚我已经另有安排了。