人教版九年级全册Unit 6 When was it invented？课件(共14张PPT)

(共14张PPT)
课题：Unit 6 When was it invented
九年级英语-全一册-unit6
难点名称：能正确使用一般过去时的被动语态，能简要谈论发明的历史。
目录
CONTENTS
Do you know what these inventions are
导入
the first telephone
the first car
the first television
Karl Benz
Do you know who these inventors are
Alexander Bell
J. L. Baird
导入
一般过去时被动语态结构：
was/were +过去分词
last year.
2.We planted many trees last year.
Many trees
were planted
by us
1.They bought a camera last term．
by them last term.
A camera
was bought
知识讲解
难点突破
The passive voice.
被动语态
主动语态变被动语态的结构图:
Bell invented the telephone in 1876.
The telephone was invented by Bell in 1876.
主语
谓语动词过去时
宾语
时间状语
主语
谓语动词的过去分词
宾语
时间状语
Karl Benz invented the first car in 1885.
The first car was invented (by Karl Benz) in 1885.
知识讲解
难点突破
The first telephone was invented (by Bell) in 1876.
Bell invented the first telephone in 1876.
知识讲解
难点突破
The first television was invented (by J. L. Baird)
in 1927.
J. L. Baird invented the first television in 1927.
知识讲解
难点突破
被动语态的几种句型
1 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
知识讲解
难点突破
They built the house last year.
He took good care of his sister yesterday.
The house was built by them last year.
His sister was taken good care of by him yesterday.
此处按下 ，由学生来进行练习吧：
课堂练习
难点巩固
The house wasn't built by them last year.
Was the house built by them last year
His sister wasn't taken good care of by him yesterday.
Was his sister taken good care of by him yesterday
We cleaned our classroom just now.
They used this room for resting.
Our classroom was cleaned by us just now.
This room was used for resting by them.
此处按下 ，由学生来进行练习吧：
课堂练习
难点巩固
Our classroom wasn't cleaned by us just now.
Was our classroom cleaned by us just now
This room wasn't used for resting by them.
Was this room used for resting by them
主动语态变被动语态的步骤：
1. 主动语态的宾语变为被动语态的主语；
2. 主动句的谓语动词变为被动结构；
3.被动语态的否定句，一般疑问句和时态的转换要靠be动词来完成。即：否定句在be动词后面加not,一般问句be动词提前。
4. 主动句的主语变为被动句的宾语，由by引出，当不强调动作的执行者时，常省略。
小结
此处再次按下 ，由学生来进行概括总结：