Unit 6 When was it invented?单元知识总结 人教版九年级全册

Unit 6 - When was it invented
1. 课文主题概述
本单元的主题是“描述发明和历史事件的时间和过程”，重点学习如何用英语描述某事的发明时间和背景，以及如何表达不同年代的事件。学习目标包括：
使用一般过去时和被动语态描述发明或发现的时间。
掌握与历史事件、发明相关的核心词汇和句型。
能够用英语表达关于发明或事件的背景介绍。
2. 单词与短语讲解
核心单词：
invention (n.) 发明
例句：The telephone is a great invention.
衍生词：invent (v.) 发明；inventor (n.) 发明家
discover (v.) 发现
例句：The scientist discovered a new medicine.
衍生词：discovery (n.) 发现
century (n.) 世纪
例句：The Internet was invented in the 20th century.
product (n.) 产品
例句：This is a new product made by our company.
相关短语：produce (v.) 生产，生产者
develop (v.) 发展；研发
例句：This machine was developed in Japan.
衍生词：development (n.) 发展；developer (n.) 开发者
核心短语：
be invented by 由……发明
例句：The telephone was invented by Alexander Graham Bell.
be discovered by 被……发现
例句：Penicillin was discovered by Alexander Fleming.
come out 出现；问世
例句：The new model came out last year.
be used for 被用于……
例句：This tool is used for measuring temperature.
play a role in 在……中起作用
例句：Electricity plays a role in modern technology.
3. 句型与语法重点
A. 一般过去时的被动语态
定义：过去发生的事件，通常用于描述发明、发现或历史事件。
结构：
主语 + was/were + 动词过去分词 + (by + 执行者)
例句：The light bulb was invented by Thomas Edison.
例子与练习：
The computer was invented in the 20th century.
Penicillin was discovered by Alexander Fleming.
B. 用于描述发明的句型
When was... invented
例句：When was the telephone invented
回答：It was invented in 1876.
What is it used for
例句：What is the telephone used for
回答：It is used for communication.
Who invented...
例句：Who invented the airplane
回答：It was invented by the Wright brothers.
4. 课文重点解析
课文通过对话介绍了一些重要的发明及其时间和用途：
介绍发明时间：
The airplane was invented in 1903.
讨论用途：
The telephone is used for talking to people over long distances.
提出问题：
A: When was the TV invented
B: It was invented in the 1920s.
5. 课堂练习
A. 翻译句子
电话是由贝尔发明的。
电视是20世纪发明的。
青霉素是由弗莱明发现的。
这台机器被用来制造纸张。
B. 选词填空
选词：invented, discovered, used, role, product
The telephone was ________ by Alexander Bell.
This tool is ________ for measuring size.
This machine is a new ________.
The scientist ________ a new medicine.
Electricity plays an important ________ in our life.
C. 改写句子
People invented the airplane.
→ ___________________________________________
They use this tool to cut wood.
→ ___________________________________________
6. 拓展阅读与写作
A. 阅读短文
主题：The History of the Airplane
The airplane is one of the greatest inventions of the 20th century. It was invented by the Wright brothers in 1903. Since then, airplanes have changed the way we travel. Today, airplanes are used for transportation, military, and research purposes. They play an important role in connecting people and countries.
问题：
When was the airplane invented
Who invented the airplane
What are airplanes used for
B. 写作任务
题目：Describe an Important Invention
要求：用5-8句话描述一个重要发明，包括：
发明的名称和用途。
发明的时间和发明者。
这个发明对社会的影响。
范例：
The Internet is one of the most important inventions in modern times. It was developed in the late 20th century and is used for communication, information sharing, and entertainment. The Internet has changed the way we live, work, and study. It has made information more accessible and has connected people around the world.
【编者注：这份讲义全面涵盖了Unit 6的词汇、句型、语法和课文要点，帮助学生掌握被动语态及其在描述发明和发现中的应用。】