北师大版九年级 Unit 4 Inventions and Inventors(课件).pptpage1Unit 4 Inventions and Inventorspage2一、本周教学重点:1. 复习被动语态2. 情态动词表达怀疑、确定和可能。3. 重点词汇page3二、具体内容:(一)被动语态:1. 一般现在时被动语态基本结构:主语+am/is/are+过去分词The food is placed in the oven.They are turned into heat.page42. 一般过去时被动语态基本结构:主语+was/were+过去分词Magic Squares were invented in China.Papermaking was introduced into Japan in 610.3. 情态动词被动语态基本结构:主语..