英语中有些以名词为核心的短语，使用时需用该名词的复数形式。
　　常见的主要有如下三类：
　　①表示“交往关系”的短语
　　be friends with sb. (和某人是朋友)
　　keep friends with sb. (与某人保持友好关系)
　　make friends with sb. (与某人交朋友)
　　be on good terms with sb. (与某人关系良好)
　　be on bad terms with sb. (与某人关系不好)
　　keep on good terms with sb. (与某人保持友好关系)
　　make terms with sb.(与某人达成协议)
　　have friendly relations with sb. (与某人有友好关系)
　　break off all relations with sb. (与某人绝交)
　　②“交换、交流”之义的短语
　　shake hands with (与某人握手)
　　exchange/change seats with sb (与某人交换座位)

　　exchange greetings with sb. (与某人相互问好)
　　change trains (换火车)
　　take turns (轮流)
　　③有些约定俗成的短语
　　take pains (煞费苦心)
　　at (the) pains (下苦功)
　　make arrangements (安排)
　　make preparations for (为。。。作准备)
　　keep up one's spririts (振奋精神)
　　in high spirits (情绪高昂)