Unit6Whenwasitinvented？（第1课时）

1、Unit 6 When was it invented ？ Period One （Section A 1a-2c)情境引入 four great inventions:compasspaper makinggun powderprinting情境引入 When was the _ invented ?It was invented in _ .18761885197119271976情境引入 light bulb1879Edison1. When _ the light bulb _ ? It was invented in _.2. Who _ it _ by ? It _ _ by Ed

2、ison.3. What is it _ for ? It is used for _ people _ in the dark.情境引入 The keys:1.was ; invented; 1879.2.was ; invented; was; invented.3.used; helping; see .情境引入 car 1885Benz.Practice:When was the car invented ?It was invented in 1885.Who was it invented by ?It was invented by Benz.Whats it used for

3、?Its used for traveling.A : What is the computer used for ?B :It is used for studying What is the calculator used for ?It is used for calculating . 情境引入 Bell 1876Beld 1927Kelif 1976Fen.Noyma 1971情境引入 Answer the questions below:When was it invented ?Who was it invented by ?Whats it used for ?Practice

4、Listen and match the inventions with the dates.1876_1885 _1927 _1971 _1976 _inventionshigh heelsadjustable 可调可调整的整的adjustable heelsice cream scoopscoopheated ice cream scoopinventionsinventionsslippersa batterybatteriesbattery-operated slippersListening1.Listen to the tape and finish the task 2a and

5、 2b of page 42.2.Make conversations using the informations in 2b.情境引入 The Passive Voice: 被动语态被动语态被动语态的用法被动语态的用法:1. 不知道动作的执行者时，常用被动语态。不知道动作的执行者时，常用被动语态。 eg: 1） My bike was stolen yesterday. 2) This car is made in America.2. 不必要说出动作的执行者时，常用被动语态。不必要说出动作的执行者时，常用被动语态。 eg: Rome was not built in a day .3.

6、为了突出强调动作的承受者时，常用被动语态。为了突出强调动作的承受者时，常用被动语态。 eg:Thousands of beaches are polluted.情境引入 The Passive Voice: 被动语态被动语态主动语态变被动语态的步骤：主动语态变被动语态的步骤：1.把主动语态句中的动作的承受着变成被动语态句中的主把主动语态句中的动作的承受着变成被动语态句中的主语。语。2.把动词改为被动形式，即把动词改为被动形式，即“be+动词的过去分词动词的过去分词”。注意。注意be动词要按新的主语的人称和数的变化而改变。时态要和动词要按新的主语的人称和数的变化而改变。时态要和原来的主动语态时态

7、保持一致。原来的主动语态时态保持一致。3.原主动语态句中的主语，如果需要，就放在原主动语态句中的主语，如果需要，就放在by的后面，的后面，要变成它相对应的宾格形式，如果不需要，可以省略。其要变成它相对应的宾格形式，如果不需要，可以省略。其它成分不变。它成分不变。 被动语态的构成：被动语态的构成： 主语主语 + be + 动词的动词的.过去分词过去分词常见的几种时态的被动语态的句型。常见的几种时态的被动语态的句型。一般现在时：主语一般现在时：主语 + be ( am / is / are ) +动词的动词的 过过去分词去分词 + -.一般过去时：主语一般过去时：主语 + was / were +

8、 动词的过去分词动词的过去分词 + -.一般将来时：主语一般将来时：主语 + will / shall + be +动词的动词的 过去过去分词分词 + -.含情态动词时其构成：主语含情态动词时其构成：主语+情态动词情态动词 + be + 动词动词的的.过去分词过去分词.The Passive Voice: 被动语态被动语态Exercises用所给单词的正确形式填空：用所给单词的正确形式填空：1)When was the telephone _ (invent)? 2)The computer can _ (help) us do math problems. 3)In those day, the woman couldnt _(afford) a TV because they were really expensive. 4)A friend of _ (I) came to see me last week. 5)I think you need to _ (take) a history class.The keys:1) invented 2