5、dmanywiseideasaboutnatureandhumanbehavior.who和whom引导的定语从句:who, whom用于指人,who 用作主语,whom用作宾语。在口语中,有时可用who代替whom, 可省略。(总结:who在定语从句中作主语时不能省略;whom在定语从句中作宾语时可省略)。例如:The girl who often helps me with my English is from England.(作主语)Who is the teacher (whom) Li Ming is talking to? 正在与李明谈话的老师是谁?(作宾语)4.Hismain