Unit 6 when was it invented?
Grammar Focus
李 兰
一． Teaching Aim:
1. 学习掌握下列词汇：fridge, low, somebody, translate, lock, earthquake, sudden, all of a sudden, biscuit. Cookie, instrument.
2. 进一步巩固Section A 的生词和词组。
3. 进一步学习运用一般过去时态的被动语态。
4. 掌握主动语态变被动语态的方法，并通过不同方式的练习来熟练运用。
二． Teaching Key Points:
1. 学习生词 fridge, low, somebody, translate, lock, earthquake, sudden, all of a sudden, biscuit, cookie, instrument.
2. 复习巩固Section A 部分所学的生词和词组，达到熟练运用的目标。
三． Teaching Difficult points:
1. 一般过去时态的句子变为被动。
2. 综合运用所学的知识进行练习运用。
四． Teaching process:
Step 1: 通过四个重大发明的复习，引出本单元的一般过去时被动语态的重要句型。
The computer was invented in .
The computer by .
The car was invented in .
The car by .
The telephone was invented in .
The telephone by .
The television was invented in .
The television by .
Step 2. Look and Say:
通过日常生中常见的小发明的介绍继续操练句型。
The bicycle was invented in .
The bicycle by .
The eraser was invented in .
by .
Ball pens were invented in .
by .
Plastic bags were invented in .
by .
Step 3:Observe and Say:
The bicycle was invented in 1816 .
The eraser was invented by Biro.
Ball pens were invented in 1938. .
Plastic bags were invented by Shusney.
主语+ was/were+PP+(in…by…)
Step 4: 一般过去时被动语态的四种基本句型：
1. 肯定句：主语+was/were+PP+(in…by…)
2. 否定句：主语+was/were+not+PP+（in…by…）
3. 一般疑问句：Was/Were+主语+PP+(in…by…)?
4. 特殊疑问句：特殊疑问词+was/were+主语+PP+(in/by)?
Step5. Summary:
Passive voice ；主语+be+PP+（in…/by…）
一般现在时被动语态：主语+is/am+are+PP+(in…+by…)
一般过去时被动语态：主语+was/were+PP+(in…by…)
Step 5: How to change the active voice into the passive voice.
Einsten invented the light bulb.
The light bulb was invented by Einsten.
(1). 主动语态中的宾语变为被动语态中的主语。
(2). 主动语态中的主语变为被动语态中的介词宾语。
(3). 主动语态中的动词过去时变为was/were+PP.
注意：准确找出动作的执行者和承受者是关键。主动语态中的主语往往是动作的执行者，而被动语态的主语往往是动作的承受者。