Who's calling this early?

是谁这么早打电话来？

Could I tell... who's calling?

我能告诉…是谁打的电话吗？

Could I tell him who's calling?

我能告诉他您是谁吗？

May I tell him who's calling?

我能告诉他谁打的电话吗？

May I tell her who's calling?

我能向他转告您是谁吗？

May I let him know who's calling?

我要让他知道是谁打来的？

Principal: Who's calling, please?

校长：请问谁在打电话？

Who's calling this early?!

是谁这么早打电话来？ ！

Yes, he is. May I ask who's calling?

是的，他在，请问是谁找他？

May I ask who's calling?

请教一下你是谁？

This is Doris. Who's calling please?

我是多丽丝。请问您是哪位啊？

Excuse me, I must see who's calling.

对不起，我得去看看是谁打来的电话。

Who's calling, please?

请问是谁呀？

Yes, it is, yes. Who's calling, please?

是，对，是，请问你是哪位？

May I ask who's calling? (This is Judy.)

请问你是？我是茱迪。

May I ask who's calling? B: This is Beth.

请问是哪位打来的？ B：我是贝丝。

Who's calling you? You don't have a friend.

谁在给你打电话？你又没有朋友。

Certainly. May I ask who's calling, please?

没问题，请问您是哪一位呢？

Who's calling, please?Who are you looking for?

请问您是哪位?请问找谁?。

It's better to ask "May I know who's calling?"

最好问“我能问是哪位打来的吗？”