九年级新目标英语Unit6 When was it invented全单元.ppt

Look at the things. In what order do you think they were invented? 2b Listen again and match the items with  their inventors and uses. 主动语态变为被动语态的步骤: They speak English. 主语 谓语 宾语 English is spoken by them. 主语 谓语动词的过去分词 宾语 (1)主动语态的宾语变成被动语态的主语。 (2)主动语态的谓语动词变为被动语态的谓语动词，即”“be+及物动词的过去分词”(be有时态、人称和数的变化)。 (3)主动语态的主语变为by的宾语。 五、被动语态的时态表示 被动语态的时态一般只通过be表现, 过去分词 不变。例如： 一般现在时: The trees are planted by the farmers. 一般过去时: The trees were planted by the farmers. 现在进行时: The trees are being planted by the farmers. 一般将来时：The trees will be planted by the farmers. 现在完成时：The trees have been planted by the farmers. 含情态动词的被动语态：The trees can (must,should) be planted by the farmers. 六、被动语态的几种句型： 肯定句 主语+be+过去分词+(by…) A sweet song was sung by her on the stage. 否定句 主语+be+not+过去分词+(by…) A sweet song wasn’t sung by her on the stage. 一般疑问句 Be+主语+过去分词+(by…) Was a sweet song sung by her on the stage? 特殊疑问句 疑问词+be+主语+过去分词+(by…) Where was a sweet song sung by her? 1. The woman asked the policeman for help. 2. The old man on TV tells a story on Sunday. 3. Do they use the box as a table? 4. She sent me a collection last week. 5. The teacher doesn’t teach us math this term. 6. Did Lily buy her sister a hat? 7. We often hear him play the violin at home. 8. The lazy boy didn’t wash clothes yesterday. 9. Students listen to the kind teacher carefully. 10.When did your father took you to the park. A: What do you think is the most helpful invention? B: I think the most helpful invention is the vacuum cleaner. A: Why is that? B: Well, it can help me clean the floor when mother asks me to do the cleaning. A: What do you think is the most annoying invention? B: I think the most annoying invention is the air-conditioner. A: Why is that? B: Well, I feel uncomfortable in t