It is urgent I talk to Mr. Barr now.

我有急事要找巴尔先生.

I need to get in contact with Mr. Barr right away.

I need to talk to Mr. Barr immediately.

I'm calling about tomorrow's meeting.

有关明天开会的事给您打电话.

I'm returning your call.我给您回电话.

I'm calling you back.

Hello.喂 你好

Oh, hello. Is Mark there?

Speaking. 我就是

This is me/he/she.是我

This is Mr. Sato speaking. 对，我是佐藤

It's me. *常用于关系非常亲密的场合

ABC Business College, may I help you? ABC商务学院，你有什么事？

Thank you for calling ABC Business College. Can I help you?

Who's calling, please? 您是哪位?

Who's speaking, please?

Who is this, please?

May I ask who's calling?

Who should I say is calling?

Who in particular would you like to talk to? 特别、尤其

（您想找哪位接电话）

He's been expecting your call. 他一直在等您的电话* He's是He has的省略

Which Suzuki do you want to talk to?

您要找哪个铃木？

There are three Suzukis here. 有三位姓铃木的。

Would you mind calling back later?

您能过会儿再打吗？

Could you call back later?