I'm afraid I'll be tied up at 3 o'clock this afternoon.
1. I'm afraid...恐怕...
I'm afraid I can't do it.
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?
be busy with
I'm busy with my homework.
A:Hello,this is Steven.May I speak to Mr.Xu?
A:I need to make an appointment with you today.
B:Ok,what time is it?
A:3 o'clock this afternoon.
B:I'm afraid I'll be tied up at 3 o'clock this afternoon.Could you make it 5 o'clock this afternoon?
A:Yes.That would be better.