John is tied up at the present time.

John现在有事。

Can I leave him a voice in mail?

我可以在他的语音信箱里留话吗？

We're having a small to-do, and I'd really be happy if you come.

我们打算热闹一下，我真心的希望你能赏光。

All right. Please hold two orchestra seats for us.

好，请帮我们保留两张前排的座位。

Can you confirm that the meeting is at 9:00 a.m.?

你能否确认一下，开会的时间是早上9点吗？

I don't know how to solve the problem. Will you help me out?

我不知道该怎么解决这个问题。你能帮我吗？