Unit 4 Amazing Plants and Animals Section B (2a～2d) 教学设计 2026-2027学年英语人教版八年级上册

该初中英语教学设计聚焦构词法（-ance/-(t)ion/-ness/-ity后缀）与青蛙生态主题语篇，通过Quick Quiz猜词复习habit、disappointed等旧词，引出frog主题，再以2a词汇分类活动搭建支架，衔接2b构词法规则学习，梳理词汇派生与语篇应用脉络。 该资料以任务型教学法和构词法归纳法为特色，通过构词填空练习提升语言能力，引导学生归纳后缀规律培养思维品质，结合青蛙生态语篇渗透文化意识（保护生物多样性），合作讨论保护方法发展学习能力。助力学生掌握构词技巧与生态知识，帮助教师高效整合词汇与主题教学。

Unit 4 Amazing Plants and Animals Section B (2a~2d) 教案 —— 词汇与语篇课：构词法与青蛙生态（人教版八年级上册 2026-2027学年） 课题 Unit 4 Amazing Plants and Animals Section B (2a~2d) 学科 英语 年级 八年级 教材版本 人教版（2024） 课时 第 2 课时 课型 词汇与语篇课 教学方法 任务型教学法、构词法归纳法、语篇填空法、合作讨论法 教学用具 多媒体课件、黑板、粉笔 教学目标 ①语言能力：掌握-ance/-(t)ion/-ness/-ity后缀构词规则，能根据词根写出名词形式，在语境中准确运用词汇正确形式完成句子和语篇填空。②学习能力：通过分类归纳掌握后缀构词法，运用语篇线索完成2d青蛙主题语篇填空。③思维品质：分析后缀构词规律培养归纳思维，结合青蛙生态语篇思考生物多样性保护。④文化意识：了解青蛙在生态系统中的重要作用，增强保护野生动物和生态环境的意识。 教学重难点 重点：掌握四种后缀构词规则，能根据语境准确选用词汇正确形式完成句子填空。难点：区分不同后缀的适用范围，在真实语篇中综合运用词汇正确形式，正确运用语法线索（所有格、动词原形、转折副词）完成语篇填空。 一、教学过程 Step 0 Learning Objectives（学习目标展示）（2 min） 【教师活动】T: Good morning, class! Today we'll learn Section B (2a~2d). Let's look at our learning objectives for today's lesson. 【教师活动】T: 本课学习目标：①掌握后缀-ance/-(t)ion/-ness/-ity构词法，能根据词根写出正确的名词形式。②能在语境中准确运用构词法派生名词完成填空。③能运用语篇线索完成2d青蛙主题语篇填空。④了解青蛙的生态重要性，增强保护野生动物的意识。 【学生活动】Ss: (学生阅读学习目标，了解本课学习重点：构词法、语篇填空、生态保护) 【提示】学习目标关联：本课构词法（-ance/-(t)ion/-ness/-ity）是扩展词汇量的重要工具，掌握后可将已学形容词/动词转化为名词，丰富写作和阅读中的词汇表达。2d语篇填空则将构词法与生态保护主题结合，实现语言知识与现实话题的融合。 Step 1 Warm-up（Quick Quiz猜词复习）（5~6 min） 【教师活动】T: Before we start, let's do a quick quiz to review some words from Section B (1a~1f). Read and guess the word. 【教师活动】T: Read the first one. "It's a thing you do often, like brushing teeth every morning. What word is it?" — The answer is "habit". And the second: "It's a feeling when you're not happy with something, like when your team loses a game." — The answer is "disappointed" or "angry". 【学生活动】Ss: (学生阅读描述并猜测单词：habit（习惯）、disappointed（失望的）/ angry（生气的）) 【教师活动】T: Now the next two. "It's sweet. Bees make it, and people love to put it on bread or use it in drinks." — The answer is "honey". And: "It's a small animal that can live both on land and in water. It jumps with long legs. It helps farms by eating insects." — The answer is "frog". 【学生活动】Ss: (学生猜测：honey（蜂蜜）、frog（青蛙）) 【知识点】Quick Quiz复习了4个核心词汇：habit（习惯）、disappointed/angry（失望/生气的）、honey（蜂蜜）、frog（青蛙）。其中frog引出本课2d语篇的主题——青蛙的生态作用。 【教师活动】T: Very good! You remembered these words well. Especially "frog" — today's passage is all about frogs and why they are important to our ecosystem. Let's move on. 【学生活动】Ss: (学生对Quick Quiz答案进行自我评价，标记不确定的词汇以便课后复习) 【过渡语】好，热身猜词完成。接下来进入2a活动，找出不同类的词。 Step 2 Activity 2a（找出不同类的词）（3~4 min） 【教师活动】T: Activity 2a — Circle the odd ones. Then give your reasons. Look at each group of words carefully and find the one that does not belong. Think about word class, meaning, or form. 【学生活动】Ss: (学生观察每组词汇，找出不同类的词，并给出理由——可能是词性不同、语义范畴不同或构词方式不同) 【教师活动】T: Great job! Let's check your answers together. For each group, the odd one out has a different word class, meaning, or form from the others. 【学生活动】Ss: (学生分享各组答案和分类理由，教师引导全班核对) 【知识点】2a核心策略：找出不同类词汇的依据包括①词性差异（名词vs动词vs形容词）；②语义范畴（动物vs植物vs非生物）；③构词方式（后缀不同）；④拼写规则。通过此活动复习Section A和B的词汇分类。 【过渡语】2a完成。接下来进入2b，学习用后缀构词。 Step 3 Activity 2b（后缀构词法）（8~10 min） 【教师活动】T: Activity 2b — Add the endings -ance, -(t)ion, -ness, and -ity to form nouns. Use your dictionary. First, let's learn the rules. 【学生活动】Ss: (学生打开字典或词汇表，尝试为每个词根添加正确的后缀，完成2b练习) 【教师活动】T: 构词法规则：在一个单词后面加后缀可以构成新词。后缀-ance、-(t)ion、-ness、-ity一般改变词性，不改变词义。例如：accept (v.) → acceptance (n.) 接受；suggest (v.) → suggestion (n.) 建议；happy (adj.) → happiness (n.) 幸福；popular (adj.) → popularity (n.) 流行。 【学生活动】Ss: (学生学习后缀构词规则：-ance加在动词后变成名词（如accept→acceptance）；-(t)ion加在动词后变成名词（如suggest→suggestion）；-ness加在形容词后变成名词（如happy→happiness）；-ity加在形容词后变成名词（如popular→popularity）) 【教师活动】T: Now let's check the answers for Activity 2b. Here are all the nouns we can form: action, kindness, reality, connection, communication, goodness, appearance, imagination, popularity, importance. 【教师活动】T: Let's check these one by one. act → action, kind → kindness, real → reality. These are the most basic ones. 【教师活动】T: connect → connection, communicate → communication, good → goodness, appear → appearance. These are also very common in daily English. 【教师活动】T: imagine → imagination, popular → popularity, important → importance. Pay attention to the spelling changes — imagine loses 'e' before adding -ation. 【学生活动】Ss: (学生核对2b答案：act→action, kind→kindness, real→reality, connect→connection, communicate→communication, good→goodness, appear→appearance, imagine→imagination, popular→popularity, important→importance) 【知识点】2b后缀构词法归纳：①-ance后缀：accept→acceptance（接受），appear→appearance（外貌）；②-(t)ion后缀：act→action（行动），connect→connection（联系），communicate→communication（交流），imagine→imagination（想象力），suggest→suggestion（建议）；③-ness后缀：kind→kindness（善良），good→goodness（善良/美好），happy→happiness（幸福）；④-ity后缀：real→reality（现实），popular→popularity（流行/受欢迎），important→importance（重要性）。注意后缀一般改变词性而不改变词义。 【提示】构词法记忆技巧：①-ness最常见，几乎可以加在所有形容词后面变成名词（如happy→happiness, sad→sadness, weak→weakness）；②-ity多用于以-al结尾的形容词（如real→reality, popular→popularity, possible→possibility）；③-(t)ion多用于动词（如act→action, connect→connection, suggest→suggestion）；④-ance也用于动词（如accept→acceptance, appear→appearance）。区分关键看原词词性。 【提示】拼写变化注意：部分单词加后缀时会发生拼写变化。如imagine→imagination（去e加-ation），communicate→communication（去e加-ion），popular→popularity（去r加-rity）。这些变化需特别记忆，避免直接加后缀导致的拼写错误。 【过渡语】构词法规则学习完毕。接下来进行练习，用构词法完成填空。 Step 4 Exercises（构词法填空练习）（8~10 min） 【教师活动】T: Now let's do some exercises. Complete the sentences with the correct forms of the words in 2b. Read each sentence carefully and think about what part of speech is needed. 【学生活动】Ss: (学生独立完成10道构词法填空题，先判断空格处所需词性，再回忆对应词根和后缀) 【教师活动】T: Let's check the first group. Sentence 1: "Will time travel ever become a _______?" — We need a noun after "a", so the answer is "reality". 【教师活动】T: Sentence 2: "Don't judge a person by their ___________; true beauty is inside." — The answer is "appearance" (外貌). Sentence 3: "Her ________ shows in small things, like sharing snacks with friends." — The answer is "kindness" (善良). 【教师活动】T: Sentence 4: "The police took immediate _______ to catch the thief after the robbery." — The answer is "action" (行动). Sentence 5: "Children's ___________ makes them believe toys can talk and trees can dance." — The answer is "imagination" (想象力). 【学生活动】Ss: (学生完成第一组5道填空题：1.reality 2.appearance 3.kindness 4.action 5.imagination，并核对自己的答案) 【教师活动】T: Now the second group. Sentence 6: "We should teach kids the _________ of saving water." — The answer is "importance" (重要性). Sentence 7: "Students should know the _________ between habits and health." — The answer is "connection" (联系). 【教师活动】T: Sentence 8: "The new coffee shop's _________ grew quickly because of its special drinks." — The answer is "popularity" (受欢迎程度). Sentence 9: "Clear ______________ between parents and children helps reduce misunderstanding." — The answer is "communication" (交流). Sentence 10: "A stranger's _________ — giving me an umbrella on a rainy day — made me feel warm." — The answer is "kindness" (善良). 【学生活动】Ss: (学生核对第二组5道填空题：6.importance 7.connection 8.popularity 9.communication 10.kindness，并核对自己的答案) 【教师活动】T: Excellent! Most of you did very well. Pay attention to sentence 10 — the word "kindness" can appear in different contexts, always meaning 善良. The key is to find the clue words in each sentence. 【知识点】构词法填空解题策略：①先判断空格处所需的词性（名词/动词/形容词）；②再回忆对应词根及后缀；③最后代入语境验证语义是否通顺。例如"become a reality"中a后面需名词，real→reality；"their appearance"中their后面需名词，appear→appearance。 【过渡语】构词法练习完成。接下来进行更多词汇运用练习。 Step 5 Vocabulary Practice（词汇运用练习）（6~8 min） 【教师活动】T: Let's do more practice with vocabulary. Fill in the blanks with the correct form of the given words. This time, you need to think about both meaning and form. 【学生活动】Ss: (学生独立完成5道词汇运用题，注意时态、人称和词形变化) 【教师活动】T: Sentence 1: "I felt ____________ when my favourite flowers died." — I felt sad, so the answer is "disappointed" (失望的). Sentence 2: "After the rain, some mushrooms _________ in the garden." — Mushrooms showed up, so the answer is "appeared" (出现). Sentence 3: "In my hometown, people often use bamboo baskets to _______ food." — We use baskets to keep food, so the answer is "store" (贮存). 【教师活动】T: Sentence 4: "What did you put in your luggage? It __________ a ton." — It was very heavy, so the answer is "weighs" (重达). By the way, 吨 is "ton" in English. Sentence 5: "I can't __________ my life without my pets. They mean a lot to me." — I can't think of life without pets, so the answer is "imagine" (想象). 【学生活动】Ss: (学生完成5道词汇运用题：1.disappointed 2.appeared 3.store 4.weighs 5.imagine，注意appeared的过去式是appeared而非disappeared，weighs用第三人称单数形式) 【知识点】词汇运用重点：①disappointed（失望的）—形容词，描述情感状态，注意与disappointing（令人失望的）的区别；②appeared（出现）—appear的过去式，注意不要与disappeared混淆；③store（贮存）—动词，表示保存/储存食物等；④weighs（重达）—weigh的第三人称单数，注意主语It用三单形式，ton（吨）是重量单位；⑤imagine（想象）—动词，后接名词或doing sth.。 【提示】常见错误提醒：①disappointed vs disappointing：disappointed描述人的感受"感到失望的"，disappointing描述事物"令人失望的"；②appear vs disappear：appear是"出现"，disappear是"消失"，注意前缀dis-表示否定；③weigh的三单形式：weigh→weighs（加-s），不要写成weight（名词"重量"）。 【过渡语】词汇运用练习完成。接下来进入2d语篇填空，阅读关于青蛙的文章。 Step 6 Reading & 2d（语篇填空——青蛙主题）（8~10 min） 【教师活动】T: Activity 2d — Read the passage about frogs and fill in the blanks. This passage tells us about the importance of frogs in our ecosystem. First, read the whole passage quickly to get the main idea. 【学生活动】Ss: (学生快速通读语篇，了解文章大意——青蛙在生态系统中的重要作用) 【教师活动】T: Let's read the passage together. "You may not realize it, but frogs play an important role in our _________ ecosystem." — This is about frogs' role, and we need a possessive noun. The answer is "planet's" (地球的). "The smallest frogs are about the size of a pea, while larger ones can grow as big as a human hand." — "while" means "然而；而". 【教师活动】T: "Many people know that frogs help to __________ farms by eating insects." — Frogs help farms by eating harmful insects. The answer is "protect" (保护). "__________, not everyone understands their __________ in nature." — This is a transition showing contrast. The answer is "However" (然而). And the second blank: "importance" (重要性). 【教师活动】T: "Frogs can live on __________ and in water." — Frogs live both on land and in water. The answer is "land" (陆地). Because of this, frogs are popular subjects in studies on climate change and the ecosystem. 【学生活动】Ss: (学生阅读语篇并填写5个空：1.planet's 2.protect 3.However 4.importance 5.land，结合语境和语法线索验证答案) 【知识点】2d语篇填空答案与解析：①planet's（地球的）—所有格形式，在ecosystem前表示"我们地球的生态系统"；②protect（保护）—动词原形，help to do sth.结构，to后面接动词原形；③However（然而）—副词，位于句首用逗号隔开，表示转折；④importance（重要性）—名词，their后面需接名词，their importance=它们的重要性；⑤land（陆地）—名词，与in water构成on...and in...的并列结构。注意pea意为"豌豆"，a human hand意为"一只人手"。 【提示】语篇填空解题技巧：①通读全文把握大意，不急于填空；②分析空格前后的语法线索（如冠词a后接名词、to后接动词原形、所有格's等）；③注意上下文逻辑关系（转折词However、并列结构on...and in...）；④填完后通读全文检查语义是否连贯通顺。 【学生活动】Ss: (学生两人一组互相核对2d语篇填空答案，讨论有分歧的空格，结合语法规则和语境共同判断正确答案) 【过渡语】语篇填空完成。接下来根据关键词复述语篇。 Step 7 Retelling（根据关键词复述）（4~5 min） 【教师活动】T: Let's retell the passage with the help of the following key words. Use these phrases to organize your retelling: "... play an important role in ... / The smallest ..., while larger ones ... / Many people know ... but not everyone understands ... / Frogs can live ... Because of this, they are ..." 【教师活动】T: First, practice retelling with your partner. Take turns — one person retells the first part, and the other person adds the next part. Use the key words to help you. 【学生活动】Ss: (学生两人一组练习复述，轮流讲述语篇的各个部分，使用关键词提示) 【教师活动】T: Now let's hear from some of you. Who wants to try retelling the whole passage? Don't worry about making mistakes — just try your best. 【学生活动】Ss: (学生根据关键词复述语篇：第一部分讲述青蛙在生态系统中的重要作用，最小的青蛙只有豌豆大，最大的有人手那么大；第二部分讲述很多人知道青蛙帮助农田吃害虫，但不是所有人都理解它们在自然中的重要性；第三部分讲述青蛙可以生活在陆地和水中，因此成为气候变化和生态系统研究的热门对象。注意使用while表示对比、however表示转折、because of this表示因果，时态统一使用一般现在时。) 【过渡语】复述完成。接下来思考如何保护青蛙。 Step 8 Think & Discuss（保护青蛙讨论）（4~5 min） 【教师活动】T: Think about what you can do to protect frogs. Discuss with your partner and share your ideas. 【教师活动】T: Here are some suggestions. First, don't catch or kill frogs — frogs are helpful animals that eat insects on farms. Second, don't litter near ponds or rivers — this protects frogs' habitats. 【教师活动】T: Also, spread the importance of frogs — let more people know how important frogs are to our ecosystem. And call on more people to protect frogs — collective action is more powerful. 【学生活动】Ss: (学生讨论保护青蛙的方法：Don't catch or kill frogs（不要捕捉或杀害青蛙）、Don't litter near ponds or rivers（不要在池塘或河流附近乱扔垃圾）、Spread the importance of frogs（传播青蛙的重要性）、Call on more people to protect frogs（呼吁更多人保护青蛙）) 【学生活动】Ss: (各小组派代表分享保护青蛙的行动计划，全班交流讨论) 【教师活动】T: These are great ideas. Frogs are an important part of our ecosystem. Just like bees, they need our help and protection. We should take action to protect them and their habitats. 【知识点】保护青蛙的行动建议：①Don't catch or kill frogs（不要捕捉或杀害青蛙）—青蛙是益虫，帮助农田消灭害虫；②Don't litter near ponds or rivers（不要在池塘或河流附近乱扔垃圾）—保护青蛙的栖息环境；③Spread the importance of frogs（传播青蛙的重要性）—让更多人了解青蛙的生态价值；④Call on more people to protect frogs（呼吁更多人保护青蛙）—集体行动力量更大。与蜜蜂保护主题形成呼应。 【教师活动】T: 保护青蛙的讨论让我们认识到，保护野生动物不仅是科学家的责任，也是每个人的义务。现在让我们进行本课总结和作业布置。 Step 9 Summary & Homework（2~3 min） 【教师活动】T: Let's summarize what we learned today. First, we reviewed some words through a Quick Quiz. Then we learned four suffixes: -ance, -(t)ion, -ness, and -ity, and practiced using them to form nouns. 【教师活动】T: We also completed exercises using these suffixes, practiced more vocabulary, and did a passage about frogs using context clues. Finally, we discussed how to protect frogs in our daily lives. 【学生活动】Ss: (学生回顾本课所学：构词法后缀规则、后缀派生名词、语篇填空技巧、保护青蛙) 【教师活动】T: Homework: 1. 搜索阅读关于"构词法"的内容，记录5-10个常见后缀及其例词，下节课分享。2. 在2d语篇后添加一个段落，进行读后续写（至少50词）。3. 复习本课构词法规则和10个后缀派生名词。4. 预习下一课时的内容。 【学生活动】Ss: (学生记录作业要求，明确各项任务的截止时间和具体要求) 【教师活动】T: For homework item 2, here is a tip: your continuation should connect naturally with the original passage. You can write about what we should do to help frogs, or why frogs are in danger. Use the vocabulary and grammar we learned today. 【知识点】本课总结：①后缀构词法—后缀-ance/-(t)ion/-ness/-ity一般改变词性不改变词义；②10个后缀派生名词—action, kindness, reality, connection, communication, goodness, appearance, imagination, popularity, importance；③构词法填空策略—先判断词性→回忆词根及后缀→代入语境验证；④2d语篇填空—planet's/protect/However/importance/land，结合语法线索（所有格、动词原形、转折副词、名词、并列名词）；⑤保护青蛙—与蜜蜂保护主题呼应，增强野生动物保护意识。 【过渡语】本节课我们学习了构词法的四种后缀规则，完成了语篇填空，还讨论了如何保护青蛙。请大家认真完成作业，下节课再见！ 二、板书设计（三栏式） 2b 后缀构词法 2d 语篇填空 词汇运用 -ance: accept→acceptance appear→appearance -(t)ion: act→action connect→connection communicate→communication imagine→imagination -ness: kind→kindness good→goodness -ity: real→reality popular→popularity important→importance 规律：后缀改变词性，不改变词义 2d答案： ①planet's 所有格 ②protect 动词原形 ③However 转折 ④importance 名词 ⑤land 名词 关键词： play an important role in the smallest...while... protect farms live on land and in water pea（豌豆） a human hand（人手） Exercises答案： 1.reality 2.appearance 3.kindness 4.action 5.imagination 6.importance 7.connection 8.popularity 9.communication 10.kindness 词汇运用： disappointed vs disappointing appear vs disappear weigh→weighs（三单） 构词法记忆技巧： -ness: 形容词→名词 (happy→happiness) -ity: -al形容词→名词 (real→reality) -(t)ion: 动词→名词 (act→action) -ance: 动词→名词 (accept→acceptance) 语篇填空解题策略： ①判断词性（名词/动词/形容词） ②回忆词根及后缀 ③代入语境验证 2d语法线索： 所有格 's help to do → 动词原形 句首转折 → However their + 名词 on...and in... 并列 易混词辨析： disappointed 描述人 disappointing 描述事物 appear 出现 disappear 消失 (dis-否定) weigh v. 称重 → weighs weight n. 重量 ton 吨（重量单位） Unit 4 Amazing Plants and Animals Section B (2a~2d) 词汇与语篇课 学科网（北京）股份有限公司 $