Who's that speaking? =Who's that?
She's not in.=She's out.
请问是哪位?我是梅.
你好,是林小姐吗?她这会儿不在,请问您哪位?
（这都是打电话时说的）望采纳但是你第一个不对啊，给的是 talking telling speakingsaying 选哪个啊？我第一个是对的，who is speaking? 也是对的。