I'm afraid I'll be tied up at 3 o'clock this afternoon.
恐怕今天下午3点我很忙。

重要词汇
1. I'm afraid...恐怕...
I'm afraid I can't do it.
我恐怕做不来。
I'm afraid he won't come.
我恐怕 他不会 来了。
2. be tied up 忙于..而抽不了身
Our manager is tied up with his work now,will you come tomorrow?
我们经理现在忙于工作抽不了空，你能明天再来吗？
be busy with
I'm busy with my homework.
我忙着做作业。

A:Hello,this is Steven.May I speak to Mr.Xu?
你好，我是史蒂芬，我可以和徐先生通电话吗？
B:Yes,speaking.
我就是，请将。
A:I need to make an appointment with you today.
我想今天和你约个时间见面。
B:Ok,what time is it?
好的，什么时候？
A:3 o'clock this afternoon.
下午三点。
B:I'm afraid I'll be tied up at 3 o'clock this afternoon.Could you make it 5 o'clock this afternoon?
恐怕今天下午3点我很忙。今天下午五点怎么样？
A:Yes.That would be better.
行，那样更好了。