一、Pre-class
1. Greeting
2. Leading-in
教师活动：Let students translate the sentences in Activity 1 into Chinese. Think about which noun is modified by the relative clause. Why do we use the relative clause? What if relative clauses are not used in these sentences?
学生活动：回看主篇阅读文本，找出文本中的定语从句，然后和同桌互相核对并翻译这些句子，最后找出这些从句所修饰的先行词。
