九年级英语4单元3a重点是什么？

这个单元的主题是 "I used to be afraid of the dark." (我过去害怕黑暗。) 核心语法点是 "used to" 的用法,用来谈论过去经常发生但现在已不再存在的习惯或状态。

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第一部分：课文原文 (3a Reading Passage)

这部分通常是一篇阅读理解文章，围绕“过去与现在的变化”这一主题展开，以下是3a文章的典型内容： How He Has Changed!**

Wang Shuoxian is a 15-year-old boy from Beijing. He has changed a lot in the last few years.

He used to have short hair. Now he has long hair. He used to wear glasses. Now he wears contact lenses. He used to be quiet. Now he is outgoing. He used to spend a lot of time alone. Now he likes to spend time with his friends. He used to hate P.E. class. Now he loves playing basketball and soccer. He used to be afraid of the dark. Now he isn't anymore. "I used to be really quiet," says Wang Shuoxian. "And I didn't use to like tests. Now I'm much more outgoing, and I don't worry about tests anymore. It's great to see how I've changed!"

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第二部分：核心知识点解析

核心语法：used to 的用法

used to + 动词原形，用来描述过去的习惯、状态或事实，暗示现在不再是这样了。

结构：

• 肯定句： 主语 + used to + 动词原形 + ...

  • He used to have short hair. (他过去留着短发。)
  • I used to be afraid of the dark. (我过去害怕黑暗。)

• 否定句： 主语 + didn't use to + 动词原形 + ...

  • He didn't use to like tests. (他过去不喜欢考试。)
  • I didn't use to eat vegetables. (我过去不吃蔬菜。)

• 疑问句： Did + 主语 + use to + 动词原形 + ...?

  • Did he use to have short hair? (他过去留着短发吗？)
  • Did you use to be afraid of the dark? (你过去害怕黑暗吗？)

重要提示：

• used to 中的 to 是不定式符号，后面必须跟动词原形。
• 在否定和疑问句中，used to 中的 d 要变成 didn't，use to 要分开写。

重点词汇和短语

• change (v./n.) 变化，改变

  • He has changed a lot. (他变化很大。)
  • Great changes have taken place in my hometown. (我的家乡发生了巨大的变化。)

• afraid (adj.) 害怕的，担心的

  • be afraid of... 害怕...
  • I'm afraid of dogs. (我怕狗。)
  • be afraid to do sth. 不敢做某事
  • She is afraid to speak in public. (她不敢在公共场合演讲。)

• dark (n./adj.) 黑暗；黑暗的

  • I can't see anything in the dark. (在黑暗里我什么也看不见。)

• silent (adj.) 寂静的，沉默的

  • The library is very silent. (图书馆非常安静。)

• from...to... 从...到...

  • He works from Monday to Friday. (他从周一工作到周五。)

• in the last few years 在过去的几年里 (现在完成时的标志)

  • I have made many friends in the last few years. (在过去的几年里，我交了很多朋友。)

• be different from... 与...不同

  • My life is different from before. (我的生活和以前不一样了。)

• take pride in... 为...感到自豪

  • He takes pride in his work. (他为他的工作感到自豪。)

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第三部分：课文翻译与解析

他变化真大！**

王硕贤是来自北京的一个15岁男孩，在过去的几年里，他变化很大。

• 解析： 开头点明了人物、年龄和地点，并用 in the last few years 这个时间状语引出“变化”这个核心主题。

他过去留着短发，现在他留长发。 他过去戴眼镜，现在他戴隐形眼镜。 他过去很内向，现在他很外向。 他过去经常花很多时间独处，现在他喜欢和朋友在一起。 他过去讨厌体育课，现在他热爱打篮球和踢足球。 他过去害怕黑暗，现在他不再害怕了。

• 解析： 这是文章的核心部分，使用了 used to do... 和 Now... 的对比句式，清晰地展示了王硕贤在外貌、性格、爱好和感受等方面的巨大变化，这是学习和运用 used to 的最佳范例。

“我过去真的非常内向，”王硕贤说，“而且我过去不喜欢考试，现在我外向多了，而且不再为考试担心了，看到自己发生了这么多变化，真是太棒了！”

• 解析： 这是引用人物自己的话，从第一人称的角度再次印证了 used to 的用法,并表达了对这种积极变化的满意和自豪之情。

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第四部分：常见考点与练习

used to 的辨析与运用

1. 单选/填空：

   • My father ____ smoke, but he gave it up last year.
     • A. is used to B. used to C. was used to
     • 答案：B (描述过去习惯,现在不抽了)
   • ____ your brother ____ play the piano?
     • A. Did; used to B. Does; use to C. Did; use to
     • 答案：C (疑问句结构)

2. 句型转换：

   • He used to be afraid of snakes. (改为否定句)
     • He didn't use to be afraid of snakes.
   • They used to live in the countryside. (改为一般疑问句并作否定回答)
     • Did they use to live in the countryside?
     • No, they didn't.

根据课文内容回答问题

1. How old is Wang Shuoxian?
   • He is 15 years old.
2. What did he use to be like?
   • He used to be quiet. / He used to have short hair. / He used to wear glasses. / He used to spend a lot of time alone. / He used to hate P.E. class. / He used to be afraid of the dark. (答出任意两点即可)
3. What does he like to do now?
   • He likes to spend time with his friends. / He loves playing basketball and soccer.
4. Why does he think it's great to see how he has changed?
   • Because he has become more outgoing and doesn't worry about tests anymore.

写作运用

** 请写一篇短文，谈谈你和你的好朋友在过去和现在有什么不同，要求使用 used to 结构。

范文示例：

My Best Friend and I

My best friend is Li Ming. We have been friends for five years, but we have changed a lot.

Li Ming used to be short and thin. Now he is tall and strong. He used to be very shy and never talked in class. Now he is much more outgoing and has made many new friends. He used to hate reading books. Now he loves reading, especially science fiction stories.

As for me, I used to be afraid of dogs. Now I'm not. I also used to play computer games all day. Now I prefer to play basketball with Li Ming.

It's interesting to see how we have both changed. We are growing up!