定语从句要怎么造句？

whom,whose,which和that等；关系副词有when,where,why等。关系词不仅起连接作用，而且还代表先行词并在定语从句中担任某一句子成分，关系代词作主语、宾语、定语、表语等，关系副词作状语。如：This is the book that my father bought me yesterday.这就是我父亲昨天帮我买的那本书。做对外汉语教师是...