Unit 2 Never Give Up but 引导的转折状语从句-2025-2026学年八年级英语下册语法知识点全解（教科版五四制）

初中教科版（五四制）8下Unit2 【寒假专版】 A版知识点全解 寒假专版 【专题】but引导的转折状语从句 语法专项突破 考频分析 教科版（五四制）8下Unit2中，but引导的转折状语从句是核心语法点，考频占句法总量的15% 左右，主要分布在核心题型：单项选择(1-2题)、完形填空（2-3题)、阅读理解(1-2题)、书面表 达（辅助考察，影响句子逻辑连贯性）。在语境理解类题目中，ut连接的前后句意对比及逻辑关系 判断往往是解题关键。 知识点二：but引导的转折状语从句 1.基本结构与功能 1.位置特点 可置于主句前（需用逗号隔开）或主句后（无需逗号），表示前后内容的对比或转折关系。 例句： 1.But he still kept trying,though he failed many times. 2.She is very young but she knows a lot. 2.时态规则 主从句时态需根据语境保持一致，常见搭配为“一般现在时+一般现在时”“一般过去时+一般过 去时”。 例句： 1.He likes playing football but he doesn't like watching matches. 2.They started early but they arrived late. 2.常见用法与注意事项 1.与though/although的区别 but不可与though/,although同时使用(“虽然…但是…”只能保留一个)。 错误：Though he was tired,but he continued working Though he was tired,he continued working./He was tired,but he continued working. 初中教科版（五四制）8下Unit2 【寒假专版】 A版知识点全解 2.否定转移现象 主句含think/believe/suppose等词时，否定需转移至主句，but从句仍用肯定形式。 例句： I don't think she is lazy but she needs more practice. 3.中考高频考点 1.语境辨析题 选项常混入and/or/so,需根据“转折”逻辑选择but。 真题示例： He is very busy,.一he always makes time for his family..(答案：but) 2.句型转换题 要求将两个简单句用but合并，注意标点与语序。 例句： 原句：She failed the exam.She didn't give up. 合并：She failed the exam but she didn't give up. 知识点三：but引导的转折状语从句 1.基本结构与用法（中考必背) 1.主句+but+转折从句（强调前后内容对比或相反） 例句：She wanted to buy a book,but the store was closed. 2.but连接两个完整句子，不可与though/although同时使用 例句：Though he was tired,he kept working.（正)/He was tired,but though he kept working.(误) 3.but后的从句可省略与主句重复的主语和be动词 例句：I like English,but not math.(省略了I like) 2.常见搭配与语义（中考常考） 1.表达“虽然…但是…”（不可与although连用） 例句：Although it rained,.we went hiking..(正)/It rained,but we went hiking.(正)/Although it rained, but we went hiking.(误) 2.表达“意外或转折结果” 例句：She studied hard,but she still failed the exam. 3.用于道歉或拒绝后的补充说明 例句：I'd love to join you,but I have to finish my homework first 3.与其他转折词的区别（中考易错） 初中教科版（五四制）8下Unit2 【寒假专版】 A版知识点全解 l.but vs..however:but是连词，直接连接句子：however是副词，需用逗号隔开 例句：He is young,but he works hard./He is young.However,he works hard. 2.but vs..while:while强调对比，but强调转折 例句：I like singing,while my sister likes dancing.(对比)/I like singing,but I can't sing well.(转折) 解题小妙招 but用法辨析妙招 although/though遇but,二者只能留一个： but是连词表转折，直接连接两分句： however作副词用，句首句中逗隔开： but连接无逗号，however逗号紧相随： 主谓时态要一致，结构清晰是关键。 考法精析 考法一：but与although/.though的混用辨析 核心：判断句子中是否同时出现but与although/hough,识别并改正语义重复错误 真题1（单句改错）： Although she was tired,but she kept studying all night 答案：删除but 解析：although/hough与but不可同时使用，句首已用Although表“虽然”，应去掉but,正确句子 为“Although she was tired,she kept studying all night” 真题2（单项选择）： -he is young,-he knows a lot about history A.Though;but B.Although;/C.But;though D./;but 答案：B 解析：although/though与but不能同时出现在一个句子中，排除A、C选项；D选项逻辑错误，“but” 表转折，不能用于句首连接“he is young”和“he knows a lot”,正确结构为“Although he is young, he knows a lot about history”,故选B 考法二：but与however用法辨析 核心：根据句子结构和标点符号，区分but（连词)与however(副词)的用法差异 真题1（语法填空）： She is very busyshe always finds time to help others. 答案：but 解析：空格前后为两个完整分句，需用连词连接，but作为连词可直接连接分句，符合语法要求。 3 初中教科版（五四制）8下Unit2 【寒假专版】 A版知识点全解 真题2（完形填空）： He failed the exam._he didn't lose heart and tried again. A.But B.However C.So D.Because 答案：B 解析：空格前后为独立分句（有句号分隔），需用副词连接：however作为副词，需用逗号与后续分 句隔开，符合”句号+However+逗号”的结构要求。 考法三：but引导转折状语从句的综合应用 核心：结合语境判断转折逻辑，正确运用时态一致性规则，掌握否定转移及强调结构(not.but) 的用法 真题1（单项选择)： I don't think he is lazyhe needs more practice to improve his grades. A and B but C so Dor 答案：B 解析：主句含think,否定需转移至主句(don't think),从句用肯定形式，根据前后逻辑“不懒但需 要更多练习”，选择转折连词but。 真题2（句型转换)： 原句：He didn't finish the work by himself.He asked for help.(用not.but.合并) 答案：He finished the work not by himself but by asking for help 解析：not.but.结构需连接并列成分，此处连接方式状语by himself和by asking for help,否定前 者肯定后者，符合“不是独自完成而是求助”的转折关系。 真题演练 演练一：单项选择（共10题） 1.She is young-she knows a lot about science. A.and B.but C.so D.or 2.he was ill,he still went to school. A.Though;but B.Although;but C.Though;/D./but 3.I called her yesterday,-she didn't answer the phone. A.so B.but C.because D.and 4.He likes playing basketball,-his brother prefers football. A.however B.but C.so D.or 5.They tried their best,they failed the competition. A.and B.so C.but D.because 6.-Do you like the new movie? 一_I think it's boring. 4 初中教科版（五四制）8下Unit2 【寒假专版】 A版知识点全解 A.So B.And C.But D.Because 7.She said she would come,_she hasn't arrived yet. A.but B.however C.so D.or 8.He is very poor,-he always helps others. A.or B.and C.but D.so 9._it rained heavily,we still went hiking. A.Though;but B.Although;/C.But;though D./;but 10.She can speak English well,_not fluently A.but B.however C.so D.and 演练二：填空试题（共10题） 1.He is very busy,_he always finds time to read books. 2.I like coffee,_my sister prefers tea. 3.She tried to solve the problem,she couldn't find the answer. 4.They worked hard,they still didn't pass the exam. 5.He said he would help me,-he forgot 6.The task was difficult,we completed it on time. 7.I called him many times,-he didn'treply. 8.Tom likes swimming,_his brother likes running 9.She is young,-she has rich experience 10.He didn't come by bus,_by bike 演练三：语法填空（共10空） Dear Lily, I'm writing to tell you about my weekend.I planned to go to the park on Saturday,1.-it rained heavily in the morning.So I stayed at home and read a book.The book was interesting,2.-it was a bit long.In the afternoon,I wanted to call you,3.-I couldn't find your phone number.I felt sad,4.-then my mom told me she had your number.I called you,5.-you didn't answer.Did you go out? On Sunday,the weather was sunny,6.-I decided to visit the library.I saw many new books there,7. I didn't have enough time to read them all.I borrowed a storybook,8.I forgot to take it home.How careless I was!9.,I went back to get it in the evening.Now I'm reading it,10.I think you will like it too. Best wishes. Lucy 5 初中教科版（五四制）8下Unit2 【寒假专版】 A版知识点全解 答案区 演练-：1B2.C3B4B5.C6.C7.A8.C9.B10.A 演练二：1.but2.but3.but4.but5.but6.but7.but8.but9.but10.but 演练三：1.but2.but3.but4.but5.but6.so7.but8.but9 However10.and 6