九年级上册英语四单元重点难点是什么？

环境保护与污染问题

下面我将主要以人教版九年级英语全一册 Unit 4 "I used to be afraid of the dark." 为蓝本,为你提供一个全面的知识点梳理和学习指南。

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单元核心主题

个人变化与成长，并通过对比“过去 vs. 来引出“曾经...，但现在...” 的句型,最终落脚到如何通过改变自己来应对环境问题。

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核心词汇

核心短语

• used to do sth. 过去常常做某事
  • 例句：I used to be afraid of the dark.
  • 对比：I am not afraid of the dark now.
• be afraid of (doing) sth. 害怕（做）某事
  • 例句：She is afraid of dogs.
• take up 开始从事；学着做
  • 例句：He took up painting last year.
• pay attention to 注意；关注
  • 例句：You should pay attention to your teacher.
• give up 放弃
  • 例句：Never give up trying.
• in the end 终于
  • 例句：He succeeded in the end.
• make a decision 做决定
  • 例句：I need to make a decision about my future.
• to one's surprise 令...惊讶的是
  • 例句：To my surprise, he passed the exam.
• even though / even if 即使；尽管
  • 例句：Even though it was raining, we went out.
• deal with 处理；应对
  • 例句：How do you deal with stress?
• regret doing sth. 后悔做了某事
  • 例句：I regret telling him the secret.
• in public 在公共场合
  • 例句：Don't sing in public.
• be proud of 为...感到骄傲
  • 例句：My parents are proud of me.

核心单词

• afraid (adj.) 害怕的
• silent (adj.) 寂静的；沉默的
• absent (adj.) 缺席的；不在的
• fail (v.) 失败；不及格
• examination / exam (n.) 考试
• private (adj.) 私人的；私有的
• guard (n.) 守卫；警卫
• require (v.) 要求；需要
• influence (n./v.) 影响
• powerful (adj.) 有影响力的；强大的
• seldom (adv.) 很少；不常
• anymore (adv.) （不再
• interest (n./v.) 兴趣；使...感兴趣
• certainly (adv.) 一定
• exactly (adv.) 确切地；精确地

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核心语法

used to do 结构

这是本单元最重要的语法点，用来描述过去经常性、习惯性的动作或状态，但现在不再是这样了。

• 肯定句： 主语 + used to + 动词原形 + ...
  • I used to be short.
  • He used to play basketball after school.
• 否定句： 主语 + didn't use to + 动词原形 + ...
  • I didn't use to like English.
  • She didn't use to live here.
• 一般疑问句： Did + 主语 + use to + 动词原形 + ...?
  • Did you use to be afraid of spiders?
  • Did he use to wear glasses?
  • 回答： Yes, he did. / No, he didn't.

辨析 be used to do 和 be used to doing

这是一个非常容易混淆的知识点,务必分清：

• be used to do：被动语态，意为“被用来做某事”。

  
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  • Wood is used to make tables. (木材被用来做桌子。)
  • This knife is used to cut bread. (这把刀被用来切面包。)

• be used to doing：意为“习惯于做某事”。

  • I am used to getting up early. (我习惯早起。)
  • She isn't used to living in a big city. (她不习惯住在大城市。)

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单元重点句型

1. 谈论过去和现在的对比：

   • — What's he like now? 他现在是什么样？
   • — He's tall and outgoing. 他又高又外向。
   • — He used to be short and quiet. 他过去个子矮而且很安静。

2. 提出建议和表达感受：

   • You should pay attention to your pronunciation. 你应该注意你的发音。
   • I'm not sure about that. 我对此不确定。
   • That's a good idea. 那是个好主意。

3. 表达变化和结果：

   
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   • As time went by, I became more and more interested in science. 随着时间的推移,我对科学越来越感兴趣。
   • Finally, I made a decision to change. 我下定决心做出改变。

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单元话题拓展

本单元不仅仅是讲个人成长，更深层次地引向了环境保护。

• 环境问题： air pollution (空气污染), water pollution (水污染), noise pollution (噪音污染), littering (乱扔垃圾), cutting down trees (砍伐树木)。
• 环保行动： We should stop polluting our planet. We should start to recycle. We can give up using plastic bags.
• 个人与环境的联系： Just as we change ourselves to be better, we should also change our habits to protect the environment.

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学习方法与建议

1. 情景记忆法： 不要孤立地背单词和短语，把它们放到具体的句子和对话中去理解和记忆，记 used to do 时，就记住 "I used to be afraid of the dark." 这个经典句子。
2. 对比法： 本单元的核心是对比，制作一个表格，左边写 "Past (过去)"，右边写 "Present ("，然后把你自己、家人或朋友的变化写进去，这样 used to do 的用法就非常清晰了。 | Past (过去) | Present ( | | :--- | :--- | | I used to have short hair. | I have long hair now. | | My father used to smoke. | He has given up smoking. |
3. 语法专项练习： 找一些关于 used to do 和 be used to doing 的选择题和填空题进行专项训练,特别是要区分清楚这两个结构。
4. 口语输出： 找一个伙伴，互相用 "What did you use to be like? How about now?" 来提问和回答,把学到的知识用起来。

希望这份详细的梳理能帮助你更好地学习九年级上册英语第四单元！祝你学习进步！