Unit 9 When was it invented学案

Unit 9 When was it invented ?学案

玉贤中学陈维

一、学习目标：1.学会谈论日常生活中几个重要发明的历史

2.学会被动语态的一般过去时结构was/were+动词

的过去分词

3.学会从对话中获取有效信息

二、情感目标：

1.通过本课的学习能激发同学们的创造激情，为人民服务。

2.通过本课的学习能理解先辈们为创造美好的生活而付出努

力，让同学们懂得珍惜美好的今天，创造更美好的明天。

三、学习过程：

1.学习贵在总结和归纳，我知道以-or结尾表示人的单词。（课后）

Inventor

2.有比较，记忆会更深。辨析invent, discover, find .

eg. He invented an excuse for being late for school.

Bell invented the phone .

Do you know who discovered America ?

I discovered the truth .

I discovered that the man was a good cook .

I found a ten-dollar bill on the road .

He found the key that I lost .

仔细研读以上例句，将单词与释义连线。

discover 重点指结果，包括无意中发现。

invent 重点指事物事先存在，经过努力探索后发现。

find 重点指不存在的事物经人们发明创造后生成.

3.我通晓历史，知道以下五种事物的发明年代。（从先到后）

（）-- ( ) – ( ) – ( ) –( )

4.我会利用1a 的句型对话，并且会格外留意be+过去分词结构。

5.听力训练了，我会抓住重点有效信息，一气呵成完成1b.

6.我要大声地告诉同学们我会用一般过去时的被动语态来表述

各个发明的年代。（1c）

7.知识点的总结，我得学会学以致用。(课后认真研读)

The passive voice （被动语态）

一、语态

英语中动词有主动语态和被动语态两种语态. 主动语态表示主语是动

作的执行者,被动语态表示主语是动作的承受者,在被动语态中动作的

执行者有时用by短语表示出来.

二、被动语态的构成：助动词be+及物动词的过去分词

am(is,are)+done 一般现在时

was(were)+done 一般过去时

三、被动语态的用法

1. 不知动作执行者时,常用被动语态.

eg. My bike was stolen yesterday.

This car is made in American.

2. 不必要说出动作执行者时,常用被动语态。

eg. Rome was not built in a day.

3. 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 .

四、主动语态变为被动语态的步骤:

They speak English. （主动语态）

主语谓语宾语

English is spoken by them. （被动语态）

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 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?

练习:

一、请把下列主动句变为被动句

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. Th e lazy boy didn’t wash clothes yesterday.

5. Students listen to the kind teacher carefully.

6.When did your father took you to the park.

★7. She sent me a collection last week.

★8. The teacher doesn’t teach us math this term.

★9. Did Lily buy her sister a hat?

★10. We often hear him play the violin at home.

二、用所给动词的正确形式填空：

1) The bike __________(fix) up by Xiao Ming yesterday.

2) Sunglasses __________ (use) for protecting people’s eyes.

3) A picture _________(put) up on the blackboard.

4) French___________ (speak) in France.

5)T eenagers should _________(allow) tochoose their own clothes. 学习体会

同学们这节课你们学到了什么？还有什么不明白的地方？请写下来。