鲁版九年级unit1-when-was-it-invented全单元课件.pptVIP

主动句变为被动句所遵循的4个步骤： 1. 把原主动句中的宾语变为被动句的主语。 2. 把动词变为被动形式即be+过去分词，并注意其人称和数随主语的变化而变化，而动词的时态则保持不变。 3. 原主动句的主语如需要则放在by后面以它的宾格形式出现（代词的宾格），如不需要则可省略。 4. 其它的成分（定语、状语）不变。 过去式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. 2 否定句 主语 + be + not +过去分词 + (by…) 3 一般疑问句 Be + 主语 +过去分词 + (by…)? A sweet song wasn’t sung by her on the stage. Was a sweet song sung by her on the stage? 4 特殊疑问句 疑问词 + be + 主语 +过去分词 + (by…)? Where was a sweet song sung by her? 各种时态的被动语态形式归纳：以give为例 一般时 进行时 完成时 现在 am / is / are given am / is / are being given has/have been given 过去 was/were given was/were being given had been given 将来 shall/will be given shall/will have been given 过去将来 should/would be given should/would have been given 含有情态动词 can/should/must/could/may be given 被动语态的运用: （1） 不知道谁是动作的执行者或没有必要知道谁是动作的执行者时。 The house is quite old. It was built in 1950. 这座房子太旧了，它是1950年建的。When will the road be opened to traffic? 这条路什么时候通车? （2） 需要强调动作的对象即宾语时。 ?Calculator cant be used in the math exam. 计算器不能用于数学考试。 ?He was awarded first prize in that contest. 他在比赛中获得了第一。 有时为了礼貌等原因不愿说出行为者,这时也常用被动语态。 The construction of the new lab must be completed by the end of next month. 新实验室必须在下个月底前完工。 You are requested to give a performance. 请你给我们表演一个节目。 （3） 特殊情况： ⑴（含有双宾语的句子变被动语态） 剖析：含双宾语的主动语态的句子变为被动语态时，常把那个指人的间接宾语变为被动语态的主语；也可把那个指物的直接宾语用作主语，但此时必须在间接宾语前加上介词 to或for。 如：He gave me a book. →I was given a book by him.（人作主语） →A book was given to me by him. （物作主语） My father bought me a bike.(变被动语态) →__________________________（主语是人） →__________________________（主语是物） ⑵感官动词和使役动词在主动句中其后的动词不定式不带to，但变被动句时必须加上to。 如：The boss made her work for 16 hours a day. →She was made to work for 16 hours a day. When was the car invented? It was invented in 1885. Who were they invented by? They were invented by Julie Thompson. What are they used for? They are used for seeing in the dark. Read the sentences and pay attention to the underlined parts. The