Unit2语法讲解及习题：时间状语从句（as soon as, since, until） 2025-2026学年沪外教版八年级英语上册

沪外教英语八上Unit2语法讲解及习题 时间状语从句（as soon as, since, until） 一、语法核心讲解 （一）as soon as 引导的时间状语从句 含义：表示“一……就……”，强调两个动作紧接着发生。 核心用法： a. 主句动作在从句动作发生后立刻进行。 例：My job begins as soon as fossilised dinosaur bones arrive at the museum. b. 谈论将来时，从句用一般现在时，主句用一般将来时。 例：I’ll call you as soon as I get home. c. 谈论过去时，主从句都用一般过去时。 例：He ran out as soon as he heard the news. （二）since 引导的时间状语从句 含义：表示“自从……以来”，强调动作从过去某一时间持续到现在。 核心用法： a. 从句用一般过去时，主句用现在完成时（have/has + 过去分词）。 例：Studying dinosaurs has been my dream job since I was little. 例：I have lived here since 2018. b. 回答 How long...? 问句时常用。 例：—How long have you studied English? —Since I was 7. （三）until 引导的时间状语从句 含义：表示“直到……为止”，强调动作持续到某个时间点才结束。 核心用法： a. 肯定句：主句动作持续到从句动作发生。 例：I keep improving my work until it matches the design I want. b. 否定句（not...until）：表示“直到……才……”，主句动作在从句动作发生后才开始。 例：We don’t stop until every bone is clean. 例：He didn’t go to bed until his mother came back. c. 谈论将来时，从句用一般现在时，主句用一般将来时。 例：I’ll wait until you finish your work. （四）核心对比表 连词 含义 时态规则 示例 as soon as 一……就…… 将来：从句一般现在时，主句将来时 过去：主从句均为一般过去时 My job begins as soon as fossilised dinosaur bones arrive. since 自从……以来 从句：一般过去时 主句：现在完成时 Studying dinosaurs has been my dream job since I was little. until 直到……为止 肯定：动作持续到从句发生 否定（not...until）：直到……才…… We don’t stop until every bone is clean. 二、习题 题型1：单项选择 1. I will tell him the news __________ I see him. A. as soon as B. since C. until D. while 2. She has been a doctor __________ she left college. A. as soon as B. since C. until D. when 3. He didn’t go to bed __________ his father came back. A. as soon as B. since C. until D. after 4. We will start the meeting __________ everyone arrives. A. as soon as B. since C. until D. before 5. I have learned 1000 words __________ last year. A. as soon as B. since C. until D. for 6. Please wait here __________ I come back. A. as soon as B. since C. until D. when 7. He will call you __________ he gets to Beijing. A. as soon as B. since C. until D. while 8. We have lived in this city __________ 2015. A. as soon as B. since C. until D. for 9. Don’t leave __________ the rain stops. A. as soon as B. since C. until D. after 10. I have known her __________ we were children. A. as soon as B. since C. until D. when 题型2：用as soon as/since/until填空 （一）基础填空 1. I’ll go to the park __________ I finish my homework. 2. He has been in this school __________ 2020. 3. We won’t leave __________ you come back. 4. She started to cry __________ she saw the sad movie. 5. I have not seen him __________ last month. （二）篇章填空 My dream job is to become a professional basketball player. I know that it’s not going to be easy, but I’m willing to work hard 1 __________ I achieve my goal. To become a professional basketball player, every day I practise shooting the ball and running 2 __________ I get up in the morning. I also watch videos of basketball games and analyse the moves of different players. I have watched almost a hundred games 3 __________ last year. I believe I can make my dream come true. I’ve been working on my history project 4 __________ yesterday, but there’s still a lot left to do. I’ll keep working on it 5 __________ it’s perfect. 题型3：句型转换 1. I will finish my homework. Then I will watch TV.（用as soon as合并） → I will watch TV __________ __________ __________ I finish my homework. 2. He started to learn English. He was 6 years old.（用since合并） → He __________ __________ English __________ he was 6 years old. 3. We didn’t start the class. The teacher came in.（用not...until改写） → We __________ __________ the class __________ the teacher came in. 4. I will wait here. You come back.（用until合并） → I will wait here __________ you come back. 5. She called me. She arrived home.（用as soon as合并） → She called me __________ __________ __________ she arrived home. 题型4：判断正误并改正 1. （ ）I have been here since 3 years. → __________ __________ 2. （ ）I will call you as soon as I will get home. → __________ __________ 3. （ ）He didn’t go to bed until his mother comes back. → __________ __________ 4. （ ）She has lived here since 2018. → __________ __________ 5. （ ）We will start until everyone is here. → __________ __________ 三、答案与解析 题型1：单项选择 1. A 解析：表示“一见到他就告诉他消息”，用as soon as。 2. B 解析：主句现在完成时，从句表“自从大学毕业”，用since。 3. C 解析：not...until 表示“直到父亲回来才睡觉”。 4. A 解析：表示“所有人一到就开始会议”，用as soon as。 5. B 解析：表“从去年开始”，主句现在完成时，用since。 6. C 解析：表示“在这里等到我回来”，用until。 7. A 解析：表示“一到北京就给你打电话”，用as soon as。 8. B 解析：表“从2015年开始”，主句现在完成时，用since。 9. C 解析：not...until 表示“直到雨停再走”。 10. B 解析：表“从小时候就认识她”，主句现在完成时，用since。 题型2：用as soon as/since/until填空 （一）基础填空 1. as soon as 2. since 3. until 4. as soon as 5. since （二）篇章填空 1. until 2. as soon as 3. since 4. since 5. until 题型3：句型转换 1. as soon as 2. has learned; since 3. didn’t start; until 4. until 5. as soon as 题型4：判断正误并改正 1. × 改正：since → for（或在3 years后加ago） 2. × 改正：will get → get（as soon as引导的将来时从句用一般现在时） 3. × 改正：comes → came（until引导的过去时从句用一般过去时） 4. √ 5. × 改正：will start → won’t start（until表“直到……才”需用否定） ( 1 ) 学科网（北京）股份有限公司 $