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[教研活动] 人教版九年级英语 Unit 6 知识梳理

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一、单元主题:When was it invented?(询问发明时间)

二、重点词汇分类记忆

1. 发明相关词汇

· 物品名词:heel(鞋跟),scoop(勺子),fridge(冰箱),ruler(尺子),basket(篮子)
· 人物名词:pioneer(先驱),hero(英雄),customer(顾客)
· 抽象名词:electricity(电),pleasure(愉快),doubt(怀疑),style(样式)

2.动词记忆组
3.mention(提及)→ spread(传播)→ boil(煮沸)→ warn(警告)
translate(翻译)→ lock(锁)→ ring(响)→ divide(分开)

3. 形容词/副词
· daily(每日的),national(国家的)
· low(低的)↔ high(高的)
· sour(酸的)↔ sweet(甜的)

4. 核心短语(需完整记忆)
短语 含义 典型用法
by accident 偶然地 描述意外发现
by mistake 错误地 描述错误行为
without doubt 毫无疑问 加强肯定语气
all of a sudden 突然地 描述突发情况
look up to 钦佩 look up to sb. as...
not only...but also... 不但...而且... 连接并列成分
三、语法核心:被动语态(一般过去时)
四、1. 基本结构
was/were + 过去分词
2. 用法要点
· 强调承受者:The telephone was invented in 1876.
· 执行者明确加by:It was invented by Bell.
· 不知/不必提执行者:English is spoken here.
3. 句式转换模板
主动:S(主语) + V(过去式) + O(宾语)
被动:O(原宾语) + was/were + 过去分词 + by + S(原主语)
4. 特殊疑问句的被动形式
When was it invented?(何时发明)
Who was it invented by?(谁发明)
What is it used for?(用途是什么)
```
四、重点句型与应答

1. 三组核心问答
1. 问时间:When was...invented? → It was invented in + 年份.
2. 问发明者:Who was...invented by? → It was invented by + 人名.
3. 问用途:What is...used for? → It's used for + V-ing/名词.

2. 扩展句型

· It is said that...(据说...)
· It is believed that...(人们相信...)
· ...take place(...发生)
五、单元写作模板
写作题目:介绍一项发明
四段式结构:
第一段:引入发明
  ...is one of the most important inventions.
  It has changed our life greatly.
第二段:发明历史
  It was invented in (年份) by (人名).
  At that time, people used to...
第三段:功能用途
  It is mainly used for...
  It can also be used to...
第四段:意义总结
  Without doubt, this invention...
  We should look up to the inventor.
必背金句:

1. The...was invented by accident/by mistake.
2. It is said that the inventor got the idea when...
3. Not only is it useful, but it is also cheap.
六、易错警示
1. 动词形式错误
✅ invented(正确过去分词)
· ❌ inventeded(错误形式)
2. be动词混淆
· 单数:was invented
· 复数:were invented
3. 介词误用
· ✅ by + 人(执行者)
· ✅ for + 用途
· ❌ from + 人(错误)

4. 主动被动混淆

· ❌ Bell invented the telephone in 1876.(主动,强调Bell)
· ✅ The telephone was invented in 1876.(被动,强调telephone)

七、高效复习法

1. 单词记忆:分类卡片法

制作三色卡片:

· 红色:名词(发明物品)
· 蓝色:动词(动作描述)
· 绿色:短语(固定搭配)

2. 语法练习:三步法

1. 找主语(承受者)
2. 变分词(动词→过去分词)
3. 加was/were(单复数判断)

3. 口语训练:问答接龙

A: When was...invented?
B: It was invented in...
A: Who was it invented by?
B: It was invented by...
A: What is it used for?
B: It's used for...

终极记忆口诀

被动语态很简单,be加过分记心间
was单数were复数,时态变化be来变
不知谁做用被动,by后加人执行现
发明时间when问,用途就用what换

Unit 6 When was it invented最终.png

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