?God helps those who help themselves. ?天助自助者。?All that glitters is not gold.? 发光的未必都是金子。?He who doesnt reach the Great Wall is not a true man.?不到长城非好汉。Unit 5 Grammar1. 引导定语从句的关系副词有：when /where /why.2. 关系副词引导定语从句的作用:（1）在从句中代替表示 时间，地点和原因 的先行词。（2）在从句中作状语成分，表示 时间，地点和原因。when引导的定语从句修饰表示 时间的名词, 在定语从句中作 时间状语, 相当于“ 介词+关系代词(which) ”。1. when的用法：The time _ I first met Nelson Mandela was a very difficult period of my life.whenIll never forget the day_I first went to school.when_he danced to the Little Apple
