一个英语句子的翻译和结构分析?

问题描述:

一个英语句子的翻译和结构分析?
Salespeople working with key customers must do more than call when they
think customers might be ready to place orders.这里的call的主语和宾语是什么?

意思是:“当感觉重要客户准备下订单时,专门负责的销售人员除了打电话之外,必须还要做更多的事情.”
主语是salespeople