第九章 Suntan and Society

  课文理解；语言点讲解；练习；语法

特殊句式：
1) The Use of Gerunds. For example:
Wealthy people usually had a tan. It became a sign of wealth.
→ Having a tan became a sign of wealth.
2) The Use of “not…until”. For example:
The differences do not appear until the conditions are right.
Not until last night did I know that my ex-husband had married.
语法:
Nonfinite Verbs & Infinitives (2) [非谓语动词-动词不定式 (2)]

    复述原文，掌握本章里出现所有语法现象，能熟练、正确使用常用词