Unit 6 单元语法：连词so...that,unless,as soon as, -ed,-ing型形容词，否定前缀（精讲）2025-2026学年八年级英语下册（新教材人教版）

八年级下册 Unit 6 Crossing Cultures 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 ③ could 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 CONTENTS 连词 so...that, unless, as soon as 课本＋拓展（练习） -ed/-ing 形容词 否定前缀 un- /im-/in- 3 PART ONE 连词 so...that, unless, as soon as 4 so...that（引导结果状语从句） ①so + 形容词 + that The movie is so moving that many people cried. 这部电影如此感人，以至于很多人都哭了。 ②so + 副词 + that He runs so fast that no one can catch up with him. 他跑得如此快，以至于没人能追上他。 so + 形容词 / 副词 + that 从句 含义：如此…… 以至于……，主句描述程度，从句说明由此产生的结果。 常用来描述：程度、感受、习俗影响、事物特征等。 基础用法 基本结构 5 so...that（引导结果状语从句） 特殊拓展结构 ①so + 形容词 + a/an + 可数名词单数 + that = such a/an + 形容词 + 可数名词单数 + that It is so interesting a book that I read it twice. = It is such an interesting book that I read it twice. ②so many /much/few /little + 名词 + that （只能用 so，不能用 such） There are so many people that we can’t get in. 人太多了，以至于我们进不去。 6 so...that（引导结果状语从句） so…that 与 such…that 对比 结构 后接内容 例句 so…that 形容词 / 副词 The box is so heavy that I can’t carry it. so + 形 + a/an + 单数名词 It’s so difficult a problem that few can solve it. so + many/much/few/little + 名词 He has so little money that he can’t buy food. such…that a/an + 形 + 单数可数名词 It’s such a difficult problem that few can solve it. 形 + 复数可数名词 They are such kind people that everyone likes them. 形 + 不可数名词 It is such bad weather that we have to stay home. 7 unless（引导条件状语从句） ①主句（否定 / 禁止） + unless + 条件 You can’t ask about salary unless you are very close. 除非关系很亲密，否则不能问薪水。 ②主句（肯定 / 允许） + unless + 例外情况 You can visit someone’s home unless they say no. 你可以去别人家拜访，除非他们拒绝。 含义：除非；如果不 = if … not ， 引导条件状语从句，常用来表达一件事只有在某种条件下才成立 / 才允许 核心用法 基本结构 8 unless = if … not 时态遵循 “主将从现 / 主情从现”。 You won’t understand it unless you try. = You won’t understand it if you don’t try. Don’t enter the room unless the teacher allows. = Don’t enter the room if the teacher doesn’t allow. You can’t ask about his age unless he talks about it first. = You can’t ask about his age if he doesn’t talk about it first. You won’t be allowed in unless you take off your shoes. = You won’t be allowed in if you don’t take off your shoes. unless（引导条件状语从句） 9 项目 内容 例句 基本含义 除非；如果不 You can’t call him by first name unless he tells you to. 同义替换 = if … not You can’t call him by first name if he doesn’t tell you to. 从句时态 一般现在时表将来 You will feel impolite unless you greet first. 主句特点 常含 can /can’t /must/shouldn’t You shouldn’t touch gifts unless the host says so. unless（引导条件状语从句） 10 as soon as（引导时间状语从句） 时态规则（考试必考点） 遵循 主将从现 / 主情从现 / 主过从过 主句将来时，从句一般现在时（主将从现） 主句含情态动词，从句一般现在时（主情从现） 主句过去时，从句一般过去时（主过从过） 含义：一…… 就……， 引导时间状语从句，表示主句动作紧接着从句动作发生，强调动作的即时性、连贯性。 核心用法 表示 “ 一 … … 就 … …” ，用于描述文化交流中 “场景触发即时动作” ，强调习俗的即时性。 11 项目 规则 例句 基本含义 一…… 就…… As soon as we meet, we shake hands. 主将从现 主句：will /be going to 从句：一般现在时 As soon as you get there, you will greet people. 主情从现 主句：can /may/should /must 从句：一般现在时 As soon as they come, you should stand up. 主过从过 主句：一般过去时 从句：一般过去时 As soon as he arrived, he said hello. 位置特点 可放句首或句中 He called me as soon as he landed. as soon as（引导时间状语从句） 12 主将从现 As soon as you arrive, you will see many traditions.你一到达，就会看到很多传统习俗。 As soon as I get home, I will call you. 我一到家，就给你打电话。 主情从现 As soon as we meet, we should greet politely.我们一见面，就应该礼貌问候。 As soon as the bell rings, we can go home. 铃声一响，我们就可以回家了。 主过从过 As soon as he saw the host, he bowed. 他一看到主人，就鞠躬了。 As soon as she finished her homework, she went to bed. 她一做完作业，就去睡觉了。 as soon as（引导时间状语从句） 13 PART TWO -ed/-ing 形容词 核心区别 -ed/-ing 形容词（描述感受与事物特征） 类型 含义 & 用法 常见单词 例句（课文主题-文化冲击） -ed 形容词 描述人的感受 “感到…… 的” embarrassed 感到尴尬的 confused 感到困惑的 surprised 感到惊讶的 interested 感兴趣的 shocked 感到震惊的 tired 感到疲惫的 ①He was surprised at the different greeting customs. 他对不同的问候习俗感到惊讶。 ②She was shocked by the strange table manners. 她被奇怪的餐桌礼仪震惊到了。 -ing 形容词 描述事物 / 场景的特征 “令人…… 的” embarrassing 令人尴尬的 confusing 令人困惑的 surprising 令人惊讶的 interesting 有趣的 shocking 令人震惊的 tiring 令人疲惫的 ①It is surprising to see people kiss in public. 看到人们在公共场合亲吻是令人惊讶的。 ② Some foreign traditions are really interesting. 一些外国传统真的很有趣。 -ed/-ing 形容词（描述感受与事物特征） 形容词形式 核心用法 搭配主语 例句 -ed 形容词 描述人的主观感受，主语是人，多表达 “感到……” embarrassed 感到尴尬的 confused 感到困惑的 surprised 感到惊讶的 interested 感兴趣的 shocked 感到震惊的 tired 感到疲惫的 Ji-Hoon felt embarrassed about the cheek kiss. 纪勋对贴面礼感到尴尬。 Anna was confused by Kaito’s bow. 安娜对海斗的鞠躬感到困惑。 -ing 形容词 描述事物 / 场景的特征，主语是事物 / 行为，多表达 “令人…… 的” embarrassing 令人尴尬的 confusing 令人困惑的 surprising 令人惊讶的 interesting 有趣的 shocking 令人震惊的 tiring 令人疲惫的 The early arrival was embarrassing for Nancy. 早到对南希来说是件令人尴尬的事。 English table manners are confusing. 英国的餐桌礼仪令人困惑。 Kaito’s bow was surprising for Anna. 海斗的鞠躬让安娜觉得很意外。 常见搭配 -ed/-ing 形容词（描述感受与事物特征） -ed 形容词（人） -ing 形容词（事物） 单元主题例句 Interested（感兴趣的） interesting（有趣的） She is interested in Japanese bowing customs. The local greeting customs are very interesting. bored（感到无聊的） boring（无聊的） He felt bored with the old tradition. The long ceremony was boring for the young people. tired（感到疲惫的） tiring（累人的） They felt tired after the long cultural experience. The cross-cultural trip was really tiring. shocked（感到震惊的） shocking（令人震惊的） I was shocked by the different dining rules. Some foreign customs are shocking to first-time visitors. 拓展搭配 PART THREE 否定前缀 un- /im-/in- happy → unhappy 不开心的 friendly → unfriendly 不友好的 lucky → unlucky 不幸的 comfortable → uncomfortable 不舒服的 usual → unusual 不寻常的 able → unable 不能的 popular → unpopular 不受欢迎的 fair → unfair 不公平的 绝大多数形容词直接加 un-，表示 “不……”。 否定前缀 un-（最常用、数量最多） He felt unhappy about the result. 他对结果感到不开心。 The chair is uncomfortable. 这把椅子不舒服。 The waiter was unfriendly to us.那个服务员对我们很不友好。 She felt unlucky to miss the bus.她觉得很倒霉，没赶上公交车。 It is unusual for him to get up late.他起床很晚，这很不寻常。 He is unable to finish the work today.他今天不能完成这项工作。 polite → impolite 不礼貌的 possible → impossible 不可能的 patient → impatient 不耐烦的 balanced → imbalanced 不平衡的 It is impolite to talk loudly in public. 在公共场合大声说话是不礼貌的。 Nothing is impossible if you work hard. 如果你努力，没有什么是不可能的。 My father was impatient when I was late. 我迟到时，爸爸很不耐烦。 An imbalanced diet is bad for your health. 不均衡的饮食对你的健康有害。 It’s impolite to laugh at others. 嘲笑别人是不礼貌的。 Nothing is impossible. 一切皆有可能。 否定前缀 im-（只用于以 b / p / m 开头的词） active → inactive 不活跃的 direct → indirect 间接的 correct → incorrect 不正确的 expensive → inexpensive 不贵的，便宜的 Your answer is incorrect. 你的答案不正确。 The shirt is inexpensive. 这件衬衫不贵。 Some students are inactive in class. 有些学生在课堂上不活跃。 He gave an indirect answer to my question. 他对我的问题给出了一个间接的回答。 Your answer is incorrect. Please try again. 你的答案不正确，请再试一次。 The pens here are inexpensive and nice. 这里的笔既便宜又好用。 否定前缀 in-（用于部分形容词，多以字母 d /l/s /c 等开头） 以 in- 为固定否定前缀 formal → informal 非正式的（× 不能说 unformal） direct → indirect 间接的 correct → incorrect 不正确的 active → inactive 不活跃的 以 im- 为固定否定前缀 proper → improper 不恰当的、不合适的（× 不能说 unproper） polite → impolite 不礼貌的 possible → impossible 不可能的 以 un- 为固定否定前缀 happy → unhappy；lucky → unlucky；friendly → unfriendly 这类词数量最多，是最通用的否定前缀。 否定前缀 un- /im-/in-的固定搭配规则 很多形容词的否定形式不能随意替换前缀，是英语长期形成的固定用法，没有绝对规律，需要重点记忆，考试常考。 这类带否定前缀的形容词，在句中常作表语或定语，八年级重点掌握以下两种句型： ①be + 否定形容词（作表语） He is impolite to his classmates. 他对同学很不礼貌。 The answer is incorrect. 这个答案是不正确的。 ②It is + 否定形容词 + to do sth.（最常考句型） It is impolite to talk with your mouth full. 嘴里含着食物说话是不礼貌的。 It is improper to arrive late at a formal dinner. 正式晚宴迟到是不合适的。 It is unfriendly to refuse others’ greetings. 拒绝别人的问候是不友好的。 It is uncomfortable to sit too close to strangers. 和陌生人坐得太近会让人不舒服。 It is incorrect to use chopsticks to point at people. 用筷子指着别人是不对的。 否定前缀 un- /im-/in-型否定形容词的常见使用结构 PART FOUR 　课本+拓展（练习） 课本 练一练 如此…… 以至于……（引导结果状语从句） 除非；如果不（引导条件状语从句，= if…not） 一…… 就……（引导时间状语从句） 蓝色字体词汇 -ed 形容词（用法） -ing 形容词（用法） 课文例句解析 surprised / surprising 描述人的感受，主语是人，意为 “感到惊讶的” 描述事物 / 场景的特征，主语是事物 / 事件，意为 “令人惊讶的” I was surprised by your bow 我对你的鞠躬感到惊讶 That’s surprising! 这件事 / 你的鞠躬令人惊讶 embarrassed / embarrassing 描述人的感受，主语是人，意为 “感到尴尬的” 描述事物 / 场景的特征，主语是事物 / 情况，意为 “令人尴尬的” Don’t look so embarrassed! 别看起来这么尴尬！ But it is embarrassing! 但这件事 / 这种情况很令人尴尬！ 2. Take off your shoes as soon as you enter someone’s home in Japan. 3. In Kenya, being late is so common that you should be patient and not expect people to be on time. 4. In China, sticking chopsticks into a bowl of rice is so rude that you should avoid it. 5. In Mexico, don’t use someone’s first name unless the person invites you to do so. 答 案 26 so that surprised as soon as surprising unless interested interesting 27 单项选择 1．The students were ________ excited about the school trip that they couldn’t sleep. A．so B．such C．very D．too 2．The boy is ________ naughty that his teacher often talks to his parents. A．so B．such C．very D．too 3．The story is ________ that all the students like it. A．so interesting B．such interesting C．so interested D．such interested 4．The box of books is ________ heavy ________ I can’t carry it alone. A．so； that B．such；that C．too；to D．enough；to 5．The flood was so ______ that it washed away many houses and cars. A．strong B．stronger C．strongest D．the strongest 6．The story was ________ moving ________ many students cried while reading it. A．so; that B．such; that C．too; to D．as; as 拓展练一练 28 7．You won’t achieve your goals ________ you work hard. A．if B．unless C．whether D．and 8．________ you finish your homework, you can’t watch TV. A．As soon as B．Unless C．So that D．Such that 9．You will fail the final exam ________ you study hard from now on. A．if B．unless C．because D．as soon as 10．— On March 30, 2020, a forest fire broke out in Sichuan. — Yes. You can’t believe how terrible the fire is _______ you see it with your own eyes. A．unless B．because C．since D．though 11．The Monkey King can’t turn himself into a man ________ he hides his tail. A．as soon as B．unless C．if D．as long as 拓展练一练 29 12．The rules were so ________ that I felt ________. A．confusing, confused B．confused, confusing C．confused, confused D．confusing, confusing 13．Which prefix is used to form the negative of “proper”? A．un-. B．im-. C．in-. D．dis-. 14．The little boy was so ________ that his face turned red when he made a mistake in public. A．embarrassed B．embarrassing C．proper D．informal 15．I will call you ________ I arrive in Beijing. Don’t worry. A．as soon as B．unless C．so that D．although 16．When you eat in India, using your left hand to hold food is considered ________. A．polite B．impolite C．normal D．common 拓展练一练 30 THE END 人教版初中英语 语法专项 31 $