Unit 6When was it invented?The four great inventions in ancient China made great contributions to human being’s progress. Paper makingcompassgunpowerprinting What are they used for?巩固More information Cai Lun invented paper.Paper was invented by Cai Lun.二、被动语态的用法：1. 不知道谁是动作的执行者，或没有必要指出谁是动作的执行者。 e.g. 过去全世界都在说英语。2. 需要突出或强调动作的承受者。e.g.这本字典在上年被大多数学生使用。一般过去时被动语态1. 肯定句： 主语+was / were+及物动词的过去分词+其他.2. 否定句： 主语+ was/were not+及物动词的过去分词+其他.3. 一般疑问句： Was/Were +主语 +及物动词的过去分词+其他? eg. 这些树是去年种的。 交流展示Listen and answer 1. what is the article talking about? A. the zipper B. the zippo C. the wibesite 2. when was the zipper invented? A. 1983 B. 1893 C. 1993 3. Was the zipper popular at that time? A. Yes B. No C. We don't know. 精讲点拨WhoWhenWhereHowWhitcomb Judson invented the zipper.zippers are used on our clothes.It can be used easily. Everybody knowshow to use it. The zipper was invented in 1893.WhatZippers are usually made of steel.The following expressions will help you.invented by … in 1893. not used widely. became popular around 1917. often used in our dail |
