Unit 2 Stay Healthy 单元语法：反身代词1、情态动词should和could、连词because（精讲）2025-2026学年八年级英语下册（新教材人教版）

该初中英语课件系统梳理了八年级下册Unit 3的三大语法模块，包括表让步/时间/目的连词、反身代词深层用法及could的多场景应用，通过对比表、功能分类、场景归纳等方式构建知识网络，如连词部分区分although/though/even if的用法差异，反身代词从宾语/同位语功能到易错点系统整合。 其亮点在于融合语言能力与思维品质培养，设计“基础辨析-易错诊断-拓展应用”分层练习，如反身代词单复数匹配题、could委婉请求与可能性辨析题，帮助学生精准掌握语法规则。同时通过固定搭配表和TIPS总结提升学习能力，教师可直接利用系统知识框架和分层练习实施针对性复习，有效巩固学生语法基础。

八年级下册 Unit 2 Stay Healthy 人教版初中英语 语法专项 1 人教版8下（单元） 语法点 Unit 1 Time to Relax ①动词不定式１ 　②一般过去时 　③一般现在时 Unit 2 Stay Healthy ①反身单词1 ②情态动词(should/chould) 　③连词(because) Unit 3 Growing Up ①表让步/时间/目的连词 ②反身代词2 ③could 的多场景用法 Unit 4 The Wonders of Nature ①形容词/副词比较级与最高级 ②大数的表达 ③so that④现在完成时1 Unit 5 Nature’s Temper ①过去进行时 ②连词when/while ③情态动词should ④复合名词 Unit 6 Crossing Cultures ①连词 so...that, unless, as soon as ②-ed/-ing 形容词 ③否定前缀 Unit 7 A Good Read ①现在完成时2 ②动词不定式２　③so…that…　 ④名动同形 Unit 8 Making a Differences ①for/since ②现在完成时与过去时的综合运用 2 情态动词should/could CONTENTS 连词because 反身代词１ 课本＋拓展（练习） 3 PART ONE 反身单词１ 4 反身代词表示 “…… 自己”，强调动作执行者与承受者是同一人 / 物，或加强语气（亲自、本人） ，是本单元的核心语法。 反身代词（Reflexive Pronouns） 人称 单数 复数 第一人称 myself（我自己） ourselves（我们自己） 第二人称 yourself（你自己） yourselves（你们自己） 第三人称 himself（他自己）、herself（她自己）、itself（它自己） themselves（他们 / 她们 /它们自己） 反身代词的构成规律 规律①：一、二人称 = 形容词性物主代词 + self/selves 反身代词 单元主题例句 用法 myself I can teach myself to repair bikes to help more kids. 我可以自学修自行车，去帮助更多孩子。 作动词宾语，对应单元（志愿者技能学习）语境 yourself You should believe in yourself when you volunteer in the hospital. 在医院做志愿者时，你要相信自己。 作介词宾语，对应单元（志愿者心态建设）语境 ourselves We can enjoy ourselves while helping the old people. 我们在帮助老人的同时，也能玩得开心。 作动词宾语，对应单元（志愿活动的乐趣）语境 yourselves Boys and girls, help yourselves to the snacks after the volunteer activity. 同学们，志愿活动结束后，大家随便吃点心。 固定搭配help oneself to sth.，对应单元（活动场景） 6 反身代词的构成规律 规律②：第三人称 = 宾格 + self/selves 反身代词 单元主题例句 用法 himself He finished the volunteer work by himself without others' help. 他独自完成了志愿工作，没有靠别人帮忙。 固定搭配by oneself，对应单元（独立完成任务）语境 herself She hurt herself when she carried books for the primary school students. 她给小学生搬书时，伤到了自己。 作动词宾语，对应单元（志愿活动中的意外）语境 itself The cat can take care of itself after we leave the animal shelter. 我们离开动物收容所后，这只猫能自己照顾自己 作介词宾语，对应单元（动物救助）语境 themselves They taught themselves to sing to cheer up the sick kids. 他们自学唱歌，来让生病的孩子振作起来。 作动词宾语，对应单元（关爱病患儿童）语境 7 反身代词的构成规律 规律③：单数用 - self，复数用 - selves（单复数对比例句） 单数（-self） 复数（-selves） You should look after yourself when you work alone. 你独自工作时，要照顾好自己。 You should look after yourselves when you work in a group. 你们团队工作时，要照顾好彼此 / 自己。 He dressed himself quickly to go to the volunteer center. 他快速穿好衣服，去志愿者中心。 They dressed themselves in volunteer uniforms before the activity. 活动前，他们穿上了志愿者制服。 The kid can feed himself now. 这个孩子现在能自己吃饭了。 The kids can feed themselves now. 这些孩子现在能自己吃饭了。 8 反身代词的核心用法 1. 作宾语（最常用） 主语和宾语是同一人 / 物，动作 “作用于自身”。 动词宾语： He hurt himself playing basketball. 他打篮球伤到了自己。 She taught herself Japanese. 她自学日语。 Enjoy yourselves at the party! 派对玩得开心！ 介词宾语： You should take care of yourself. 你应该照顾好自己。 He finished the work by himself. 他独自完成了工作。 9 反身代词的核心用法 2. 作同位语（加强语气） 放在主语 / 宾语后，译为 “亲自、本人”，可省略。 主语同位语： I myself cleaned the room. 我亲自打扫了房间。 宾语同位语： You’d better ask the teacher herself. 你最好问老师本人。 3. 作表语（系动词后） 描述身体 / 精神状态。 Just be yourself. 做你自己就好。 I’m not myself today. 我今天状态不好。 10 高频固定搭配 by oneself = alone 独自、靠自己 He finished the volunteer work by himself. enjoy oneself = have a good time 玩得开心 Did you enjoy yourself at the school party? help oneself to sth. 随便吃 / 用某物 Help yourself to some fruit, Tom. teach oneself = learn by oneself 自学 She learned to play the piano by herself hurt oneself 伤到自己 The little girl hurt herself when she fell off her bike dress oneself 自己穿衣服 My little brother can dress himself now lose oneself in 沉浸于 She lost herself in reading the storybook take care of oneself（照顾自己） You should take care of yourself when you are alone 反身代词的核心用法 11 反身代词的易错警示 ①指代一致：必须与主语人称、数一致 We can take care of ourselves. We can take care of yourself. ②不能单独作主语 I myself did it. Myself did it. ③单复数勿混 单数：yourself（你自己）；复数：yourselves（你们自己） 单数：himself；复数：themselves 反身代词的核心用法 12 小 练 1. My little sister can dress ______________ (she) now. 2. We should learn to take care of ______________ (we) when we are at home alone. 3. Be careful not to hurt ______________ (you) when you cut the vegetables. 4. The children enjoyed ______________ (they) at the summer camp last week. 5. He taught ______________ (he) to play the guitar without a teacher. 6. Help ______________ (you) to some cakes, everyone. 7. The cat can wash ______________ (it) by itself. 8. I finished the difficult homework by ______________ (I). 9. Don’t lose ______________ (you) in playing computer games, boys. 10. She felt very happy when she did the volunteer work by ______________ (she). 反身代词的核心用法 herself ourselves yourself themselves himself yourselves itself myself yourselves herself 13 PART TWO 情态动词(should/could 表建议) 　 should /could 表建议 情态动词 should could 基本含义 应该 语气较强，直接提建议、劝告 可以、不妨 语气更委婉、客气 共同规则 两者都用来给别人提建议，后接动词原形 肯定句结构 主语 + should + 动词原形 You should help others. 主语 + could + 动词原形 You could talk to your parents. 否定句结构 主语 + should not /shouldn't + 动词原形 You shouldn't stay up late. 主语 + could not /couldn't + 动词原形 You couldn't fight with your classmates. should 的用法 表 “应该”：用于提出义务、责任或较明确的建议，语气较直接，主语可为人称代词或事物。 You should wear a mask when you have the flu. 得流感时，你应该戴口罩。 We should exercise for 30 minutes every day to stay healthy. 为了保持健康，我们应该每天锻炼 30 分钟。 否定式 shouldn’t：表 “不应该”，用于提醒避免不当行为。 You shouldn’t eat too much fast food—it’s unhealthy. 你不应该吃太多快餐，不健康。 could 的用法 表 “可以”：用于提出委婉、不确定的建议，语气比 should 柔和，给对方选择空间。 You could ask the school nurse for help if you feel unwell. 如果不舒服，你可以向校医求助。 We could go for a walk after dinner to help digestion. 晚饭后我们可以散散步，帮助消化。 否定式 couldn’t：表 “不可以、不能”，用于委婉拒绝或说明没有能力做某事。 You couldn’t run around when you have a fever—it will make you tired. 发烧时不能乱跑，会让你更累。 常用提建议句型（八年级必背） You should… 你应该…… You should help your parents with housework. 你应该帮父母做家务。 You shouldn’t… 你不应该…… You shouldn’t watch TV too much. 你不应该看太多电视。 You could… 你可以……（委婉） You could ask your teacher for help.你可以向老师求助。 Why don’t you…? = Why not + 动词原形？为什么不……？ Why not go to the park this weekend? 这周末为什么不去公园呢？ What/How about doing…? …… 怎么样？ How about playing basketball after school? 放学后打篮球怎么样？ should 语气直接、强烈，表 “应该”，多用于长辈 / 老师的劝告，带有责任、义务感；could 语气委婉、客气，表 “可以”，多用于朋友同辈间的商量 TIPS PART THREE 　连词(because) because 是连词，意思是 “因为”，用来引导原因状语从句，说明动作发生的原因, 说明主句动作或状态的直接原因，语气最强，回答 why引导的问句。 基本结构 主句 + because + 原因从句 He didn't come because he was ill.他没来，因为他生病了。 I was late for school because I missed the bus. 我上学迟到了，因为我没赶上公交车。 Because + 原因从句，主句 Because I got up late, I missed the bus. 因为我起晚了，所以没赶上公交车。 Because it rained heavily, we stayed at home. 因为雨下得很大，我们待在了家里。 连词 because（表原因） 连词 because（表原因） 用法 because 引导的从句可位于主句前（用逗号隔开）或主句后，位于主句前时，强调原因；位于主句后时，补充说明原因。 Because he ate too much, David had a stomachache.因为吃得太多，大卫胃痛了。—— 强调原因 David had a stomachache because he ate too much.大卫胃痛，因为他吃得太多。—— 补充原因 不能与 but/so 同时使用：because 表原因，so 表结果，二者只能选其一。 错误： He hada fever because he caught a cold, so he stayed home.（同时用 because 和 so，语法错误） 正确： He had a fever because he caught a cold, so he stayed home.（删除 because 或 so，此处保留 so，调整为 He caught a cold, so he had a fever and stayed home.） 本单元中常用于连接 “健康问题” 与 “原因”，帮助表达身体不适的诱因。 Judy had a sore throat because she talked too much. 朱迪喉咙痛，因为她说了太多话。 Ben got a backache because he fell during PE class. 本背痛，因为他在体育课上摔了一跤。 The boy had a stomachache because he ate too much junk food. 这个男孩肚子疼，因为他吃了太多垃圾食品。 My sister got a headache because she watched TV for too long. 我妹妹头疼，因为她看电视的时间太长了。 语境应用 连词 because（表原因） PART FOUR 　课本+拓展（练习） 课本 练一练 解析1- 情态动词（表建议） 本单元用 should/shouldn’t、could 这类情态动词提建议： should/shouldn’t：表 “应该 / 不应该”，给出直接、必要的建议，如 You should see the dentist. / You shouldn’t eat so much. could：表 “可以、不妨”，语气委婉，提供可选建议，如 You could eat some soft food. can：此处表 “可能、会”，用于说明不注意会导致的后果，如 We can easily hurt ourselves. 解析2-反身代词：表示 “某人自己”，指代动作的承受者就是主语本身，本句出现的有： yourself（你自己）：对应主语you；myself（我自己）：对应主语I；ourselves（我们自己）：对应主语we 常和 hurt、look after 等词搭配，表 “伤到 / 照顾自己”。 herself ourselves yourself themselves himself itself 解析： 1 ：主语是 the girl（第三人称单数，女性），用 herself，搭配 by oneself 表示 “独自”。 2 ：祈使句的对象是 you，用 yourself。 3 ：主语是 we，用 ourselves，搭配 enjoy oneself 表示 “玩得开心”。 4 ：主语是 Mr Liu（第三人称单数，男性），用 himself，表示 “他自己本人”。 5 ：主语是 the students（第三人称复数），用 themselves。 6 ：指代 the race（事物，单数），用 itself，表示 “比赛本身”。 25 could should should shouldn’t should shouldn’t could could 解析：should：表示必须、必要的建议（比如 “明智使用手机”“每 20 分钟休息眼睛”“避免过度使用手机”）。shouldn’t：表示禁止、不应该做的事（比如 “睡前看手机”“过马路看手机”）。 could：表示委婉的、可选择的建议（比如 “调整屏幕亮度”“用听音乐代替看视频”“直接和朋友聊天代替发消息”）。 26 单项选择 1．He didn’t go to school yesterday ________ he was ill. A．so B．because C．but D．and 2．You ________ read in the sun for too long. It will cause great harm to your eyesight. A．shouldn’t B．can C．may D．will 3．You must be careful, or you will hurt ________ when you are doing sports like Liu Genghong. A．itself B．yourself C．ourselves D．oneself 4．The little boy can dress ________ now. A．him B ．his C．himself D．he 5．Li Ming wants to get to school early, ________ he usually gets up early. A．because B．so C．But 6．It began to rain, ________ we had to stay here. A．but B．Because C．so 拓展练一练 27 单项选择 7．—I have a stomachache. —You ________ eat so much ice cream. A．shouldn’t B．should C．could D．would 8．My sister is stressed out. She ________ listen to some light music to relax. A．should B．shouldn’t C．must D．mustn’t 9．— I have a bad cold and feel terrible. — You ________ go to see a doctor at once. A．should B．couldn’t C．shouldn’t D．can’t 10．You ________ eat too much candy if you want to keep your teeth healthy. A．should B．could C．shouldn’t D．couldn’t 11．—________ you please give me some advice on improving my English? —Sure. You ________ spend more time reading English novels. A．Could; could B．Should; can C．Should; should D．Must; must 拓展练一练 28 12．—Who taught you to sing this song? —No one. I taught ________. A．me B．my C．myself D．mine 13．—These days, more and more people are watching Jiangsu Football City League on the Internet. —That’s true. Watching it is just as enjoyable as playing football _________. A．it B．itself C．themselves 14．Please help ________ to some fruit, everyone. The party is just beginning. A．himself B．herself C．yourselves D．themselves 15．As we are growing up, we should learn to look after ________. A．we B．us C．our D．ourselves 16．Mary feels sure of _________. She thinks she can solve the problem. A．his B．hers C．himself D．herself 拓展练一练 29 17．I want to get a part-time job ________ I can earn money to buy a new bike. A．so B．because C．but D．and 18．When you lose ________ in the mountains, staying calm will make ________ possible to find your way back. A．you; it B．yourself; it C．you; itself D．yourself; itself 19．Some tourists fall in love with Ganzhou ________ rather than just its tourist attractions. A．Themselves B．itself C．herself D．ourselves 20．The boy is only 7 years old. He isn’t ________ to take care of ________. A．old enough; himself B．enough old; himself C．old enough; him D．enough old; him 21．Mark, I think you should tell more things about ______. It can help others know you better. A．yourself B．herself C．himself D．myself 30 THE END 人教版初中英语 语法专项 31 $