人教版九年级英语上册《When was it invented?》SectionB PPT课件下载(第3课时)，共37页。ObjectivesTo summarize the passive voice of the past tense.To think about your problem and think of the new invention to solve your problem.To write a passage to describe your invention.Revision一般过去时被动语态一般过去时的被动语态表示过去某一时刻发生的被动性动作, 其基本结构为：主语+ was / were + 过去分词+ by ...►The teacher was visited by them two years ago.他们两年前看过这位老师。主动变被动解题步骤:1. 找宾语 ——即动作的承受者2. 判断宾语的单复数 ——即be动词的单复数3. 判断动词的时态 ——即be动词的时态4. 修改谓语的时态 ——即原句动词改为过去分词5. 修改原句的主语 ——即by + 主语/ 宾语Warming upInventions are everywhere in our life.Imagine you are a business person. Write a description of your new invention. Try to sell the invention to the class.This special pen was invented by Liu Jie.It has three colors and is used for…Sample writingThis special pen was invented by Liu Jie. It has three colors and is used for taking notes quickly. It is very useful if you have a lot to write down. The pen comes with a microchip that can store a list of common words that you will use. You can program the words you will use often into the microchip’s memory, then assign a short form to each word. When you are writing, you just need to write the short forms with the pen, press a button on the pen and the short forms will change into the actual words. The microchip can contain up to 50 words and you can make changes to the list of words whenever you need to.Self checkComplete the passage with the correct form of the words in the box.invent doubt mention website all of a suddenIt is often difficult to decide on the inventor of certain inventions. This is because sometimes a few people may ______ things which are nearly the same. It’s hard to tell who came up with the idea first.Some inventions can also lead to other inventions ______________. So some people _________ whether the inventor came up with the idea himself or herself. They think that the inventor used someone else’s idea to create his or her invention. That is why books or ________ usually _________ more than one inventor when giving information about inventions.Rewrite these sentences using the passive voice.1. Someone stole my watch.2. They used five eggs to make this big cake.3. When did they invent the personal computer?4. They asked us not to run in the hallway.5. Someone took the video back to the store.HomeworkWrite an article about your favourite invention.Do some exercises about passive voice.Preview the new words in the next unit.... ... ...关键词：When was it invented? PPT课件免费下载，.PPTX格式； 本作品中主体文字及图片可替换修改，文字修改可直接点击文本框进行编辑，图片更改可选中图片后单击鼠标右键选择更换图片，也可根据自身需求增加和删除作品中的内容，源文件无水印。如认为该内容涉嫌侵权，可通过邮件提出书面通知，我们将及时处理。