复合句 状语从句-2025-2026学年初中英语语法重难点精讲（全国版）

9年级全国版 【语法专版】 复合句精讲 语法专版 【语法专题】复合句专项突破 初中全国版复合句专题 语法精讲 语法概述：时间状语从句(when/while/.as soon as)=表示动作发生时间的句子，由when（当… 时)、while(当…期间)、as soon as(一…就)引导，说明主句动作发生的时间。 条件状语从句(if/unless,主将从现)=表示主句动作发生条件的句子，由if(如果)、unless(除 非)引导，遵循”主将从现”原则（主句用一般将来时，从句用一般现在时）。 让步状语从句(though/although)=表示与主句意思相反或让步关系的句子，由though/although(虽 然/尽管)引导，表达”虽然…但是”的含义(though/.although不能与but同时使用)。 原因状语从句(because/since)=表示主句动作原因的句子，由because(因为)、since(既然)引 导，说明主句行为发生的原因(because强调直接原因，since侧重对方已知的原因)。 一、重难点讲解 重难点一：when/while/as soon as引导时间状语从句的区别讲解： whn引导时间状语从句时，从句谓语动词可以是延续性动词也可以是非延续性动词，既可表示 主句动作与从句动作同时发生，也可表示从句动作发生在主句动作之前或之后。 I was watching TV when the phone rang.(从句动作非延续性，与主句动作同时发生) When she arrives,.I will tell her the news.(从句动作发生在主句动作之前) while引导时间状语从句时，从句谓语动词必须是延续性动词，强调主句动作与从句动作同时进 行，常译为”当…期间”。 While my mother was cooking,I was doing my homework.(主从句动作同时进行，均为延续性动词) as soon as引导时间状语从句时，强调”一…就…”，主句常用一般将来时，从句用一般现在时 表将来（主将从现）。 As soon as he finishes his homework,he will go out to play. 真题再现： 1.(2024全国版教材配套期中测试)What were you doing the rainstorm came? -I was reading a book in the library. A.when B.while 9年级全国版 【语法专版】 复合句精讲 C.as soon as D.since 答案：A解析：从句谓语动词came是非延续性动词，强调？当暴风雨来的时候'，用when 引导。 2.(2023全国版教辅书练习)_my father was working in the garden,.I was watering the flowers. A.When B.While C.As soon as D.Because 答案：B解析：主从句动作'工作”和”浇花”均为延续性动词且同时进行，用whil引导。 重难点二：条件状语从句中f/nless的用法及”主将从现”原则讲解： f引导条件状语从句时，意为”如果”，遵循”主将从现”原则，即主句用一般将来时，从句用一般 现在时。 If it rains tomorrow,we will stay at home..(主句一般将来时，从句一般现在时) unless引导条件状语从句时，意为”除非，如果不'，相当于”if..not'”,同样遵循主将从现”原则。 Unless you studyhard,you won'tpass the exam.If you don't studyhard,you won't pass the exam) 注意：if引导的条件状语从句中，主句也可使用情态动词(can/may/must等)或祈使句，从句仍 用一般现在时。 If you finish your homework,you can watch TV.(主句含情态动词can) 真题再现： 1.(2024全国版教材期末真题)一_you_to the party if you一free tomorrow? -Yes,I will. A.Will;go;are B.Do;go;are C.Will;go;will be D.Do;go;will be 答案：A解析：f引导条件状语从句，遵循？主将从现'，主句用will go,从句用are free。. 2.(2023 全国版教辅书单元测试)You will miss the bus_you hurry up. A.if B.unless C.when D.though 答案：B 解析：句意为”除非你快点，否则你会错过公交车”，unless符合语境。 2 9年级全国版 【语法专版】 复合句精讲 重难点三：though/although导让步状语从句的用法及注意事项讲解： though和although都表示”虽然，尽管”，引导让步状语从句，两者可以互换，不能与but同时出 现在一个句子中，但可与yet/still连用。 Though/Although he is young,he knows a lot.Though he is young,but he knows a lot) Though it rained heavily,we still went to school on time..(可与still连用) 注意：though还可作副词，意为”不过，然而'，放在句末：although无此用法。 He said he would come,he didn't,though 真题再现： 1.(2024全国版教材期中联考)he is very old,he still works hard every day. A.Because B.Though C.If D.When 答案：B 解析：句意为”虽然他很老了，但他仍然每天努力工作”，hogh引导让步状语从 句。 2.(2023全国版教辅书专项练习)the task is difficult,.we will try our best to finish it. A.Although B.But C.So D.Because 答案：A解析：although引导让步状语从句，不能与but连用，符合语境。 重难点四：because/since引导原因状语从句的区别讲解： because表示直接原因，语气最强，回答why引导的问句，不能与so同时使用。 -Why were you late?-Because I missed the bus. since表示'既然，由于”，语气比because弱，通常放在句首，强调已知的事实。 Since everyone is here,let's start the meeting. 注意：because引导的从句可位于主句前或后，since引导的从句常位于主句前。 Idid't go to school because I was ill.(because从句位于主句后) Since you don't know the answer,.I'll tell you.(since从句位于主句前) 真题再现： 1.(2024全国版教材期末检测)-Why didn't you go swimming yesterday? I had a cold. 3 9年级全国版 【语法专版】 复合句精讲 A.Since B.Because C.Though D.If 答案：B 解析：回答why引导的问句，用because说明直接原因。 2.(2023全国版教辅书模拟试题)_you are free today,you can help me with my English A.Because B.Though C.Since D.Unless 答案：C解析：句意为”既然你今天有空，你可以帮我学英语”，snce强调已知事实，符合 语境。 易错点综合演练 I单项选择（直击重难点） 1.-What were you doing your brother came back from school? -I was cleaning my room A.when B.while C.as soon as D.since 2.it snows tomorrow,we will build a snowman in the park A.If B.Unless C.Though D.Because 3.You will fail the exam you study harder A.if B.unless C.when D.since 4.-Why did you apologize to her? I broke her favorite cup A.Because B.Though C.If 4 9年级全国版 【语法专版】 复合句精讲 D.Since Ⅱ用所给词的适当形式填空（强化句型结构） 1.While my father(cook)dinner,my mother was washing clothes. 2.If it(rain)tomorrow,we won't go to the zoo. 3.Unless you(hurry)up,you will miss the early bus. 4.Since he (know)the answer,he raised his hand quickly. Ⅲ.短文填空（综合运用复合句） 用when,while,if,unless,.because,since填空，使短文完整通顺。 Tom is a hard-working student.1.he was young,he liked reading books.2.he was reading,he always forgot the time.One day,his mother said to him,"Tom,3.you don't finish your homework, you can't watch TV tonight."Tom replied,"OK,Mom.4.I finish my homework,can I watch the cartoon?"His mother smiled and said,"Yes,you can.5.you are so interested in reading,you should also pay attention to your eyes."Tom nodded and said,"I know,Mom.6.I finish reading,I will do eye exercises.” V.连词成句（聚焦句型结构） 1.was,doing,she,homework,her,the,when,phone,rang(.) 2.you,will,the,if,party,come,to,invited,are (? 3.hard,he,unless,studies,pass,won't,the,exam ( 4.late,he,was,because,missed,he,the,bus ( V.按要求改写句子（巩固复合句用法） l.While I was listening to music,my sister was dancing.(对划线部分提间) 2.If you don't get up early,.you will be late for school.(改为同义句) 3.He didn't go to school because he was ill.(对划线部分提问) 4.When she arrived home,.her parents were having dinner.(改为一般疑问句) 参考答案 I.单项选择：1.A2.A3.B4.A 5 9年级全国版 【语法专版】 复合句精讲 Ⅱ.用所给词的适当形式填空：l.was cooking 2.rains 3.hurry 4.knew Ⅲ短文填空： 1.When 2.While 3.if 4.If 5.Since 6.When V.连词成句： 1.She was doing her homework when the phone rang. 2.Will you come to the party if you are invited? 3.Unless he studies hard,he won't pass the exam. 4.He was late because he missed the bus. V.按要求改写句子： 1.What was your sister doing while you were listening to music? 2.Unless you get up early,you will be late for school. 3.Why didn't he go to school? 4.Were her parents having dinner when she arrived home? 6