先来看看常常用到的句子有哪些：
I have a meeting / an engagement soon.
I have an engagement / a date shortly. I think I’d better / should / ought to / must go now.It’s getting dark.
I have to go quite soon.
I must leave quite soon.
I’ve got to go / leave in a few minutes.
It was fun / nice to get together again.
It was nice talking with you.
道别实例
Steven: Well. I have an appointment now.
Lily: I’m in quite a hurry too.
Steven: Good to see you. Goodbye.
Lily: Goodbye. Take care of yourself.
Lily: I guess I’d better go now.
Steven: I’ve got to be going now, too.
Lily: Ok, see you later.
Steven: So long. See you later.