Unit5原因状语从句语法精讲与专项测试卷2026-2027学年译林版英语九年级上册

译林版九年级上册 Unit 5 原因状语从句语法精讲与专项测试卷 第一部分　知识点语法精讲 一、语法概览（原因状语从句引导词总览） 表1　原因状语从句引导词总览 引导词 用法与语气 例句 because 表直接原因，语气最强，回答 why 提问 I like music because it makes me relaxed. since “既然”，双方已知的原因，常放句首 Since you are here, let’s begin. as “由于”，显而易见的原因，常放句首 As it rained, we stayed at home. for 补充说明或推测的理由，语气弱，不放句首 He must be tired, for he fell asleep soon. 二、用法精讲 （一）because：直接原因，能回答 why because 表示动作发生的直接原因，语气最强，是唯一能回答 why 提问的引导词。 He didn’t come to school because he was ill. 他因为生病没来上学。 位置灵活：从句可放在主句之后，也可放句首（加逗号）。 Because it rained, we stayed at home. 因为下雨，我们待在家里。 （二）since / as：已知的、显而易见的原因 since 意为“既然”，强调双方都知道的原因，常用于句首。 Since everyone is here, let’s start the discussion. 既然大家都到了，我们开始讨论吧。 as 意为“由于”，说明显而易见的理由，常放句首。 As the weather was fine, we went for a picnic. 由于天气很好，我们去野餐了。 （三）for：补充说明与推测 for 引导的并列分句表示补充说明或推测的依据，语气最弱，不能放在句首。 The ground is wet, for it rained last night. 地面是湿的，因为昨晚下过雨。（推测依据） 【口诀】 because 直接答 why，because so 不同现； since 既然 as 由于，for 推测放句后； because of 接名词，牢记不要混着用。 三、because 与 because of 对比 表2　because 与 because of 对比 结构 后面接什么 例句 because 从句（主语＋谓语） He was late because the bus was late. because of 名词 / 代词 / 动名词 He was late because of the traffic. 四、易错警示 1. because 与 so 不能连用：“因为……所以……”在英语中只用其一。误：Because he was ill, so he didn’t come. 正：Because he was ill, he didn’t come. 2. because 后接从句，because of 后接名词（短语），两者不可混用。 3. since / as 引导的原因从句不能回答 why 提问。 4. for 引导的分句不能放在句首。 第二部分　语法专项测试卷（学生卷） （考试时间：40分钟　满分：50分） 班级：________________　姓名：________________　　得分：________________ 说明：1. 本卷考查原因状语从句引导词 because、since、as、for 及 because of 的用法；2. 请将选择题答案写在题前括号内，其余答案写在横线上。 一、单项选择（共10小题，每小题1分，计10分） (　)1. —Why didn’t you answer my phone last night? —______ I was taking a shower. A. Because　B. Since　C. As　D. For (　)2. He didn’t go to the concert ______ he had a bad cold. A. because　B. because of　C. so　D. but (　)3. ______ you have finished your work, you may go home now. A. Because　B. Since　C. Although　D. Unless (　)4. ______ the weather was fine, we went for a picnic. A. As　B. Although　C. If　D. Unless (　)5. He must be ill, ______ he looks pale. A. for　B. because　C. since　D. as (　)6. The meeting was put off ______ the bad weather. A. because　B. because of　C. since　D. for (　)7. —Why didn’t you come to school yesterday? —______ my bike was broken. A. Since　B. As　C. Because　D. For (　)8. He was late ______ the traffic was heavy. A. because　B. because of　C. so　D. but (　)9. You can’t write “______ he loved art, so he joined the music club”, because “because” and “so” cannot appear in one sentence. A. Because　B. Since　C. As　D. For (　)10. The old man was praised ______ helping the boy. A. because of　B. because　C. since　D. for 二、用方框中所给词填空（共10小题，每小题1分，计10分） because　since　as　for　because of（可重复使用） 1. He didn’t come to the party ______ he was busy. 2. ______ you are tired, you’d better have a rest. 3. The picnic was cancelled ______ the rain. 4. She must be angry, ______ she said nothing. 5. ______ it was a holiday, the park was crowded. 6. He took a taxi ______ he didn’t want to be late. 7. ______ everyone is here, we can start the meeting. 8. He failed the exam ______ his carelessness. 9. The boy was praised ______ he helped an old man. 10. The ground is wet, ______ it must have rained last night. 三、句型转换（共5小题，每小题2分，计10分） 1. Because the traffic was heavy, he was late for the concert.（改为同义句，用because of） He was late for the concert ______ ______ ______ ______. 2. I stayed at home. I was tired.（用because合并为一句） I stayed at home ______ ______ ______. 3. —Why was the bus late?（用because of完成答句） —______ ______ the heavy fog. 4. Since you have known the news, you can tell others.（对画线部分提问） ______ ______ you tell others? 5. For the ground was wet, it must have rained last night.（for不能放在句首，请重写为正确的句子） ______ 四、根据汉语提示完成句子（共5小题，每小题2分，计10分） 1. 因为他生病了，他没有来上学。（用because从句） He didn’t come to school ______ he ______ ill. 2. 既然大家都到了，我们就开始会议吧。（用since放句首） ______ everyone is here, let’s start the meeting. 3. 由于大雨，航班被取消了。（用because of） The flight was cancelled ______ ______ ______ ______. 4. 他肯定很累，因为他一坐下就睡着了。（用for表推测） He must be very tired, ______ he fell asleep as soon as he sat down. 5. 因为我们都热爱音乐，我们加入了校合唱团。（用as放句首） ______ we all love music, we joined the school choir. 五、语篇填空（共10空，每空1分，计10分） because　since　as　for　because of（可重复使用） Last month our school held a music festival. I enjoyed it very much 1.______ there was wonderful music everywhere. 2.______ my friend Lily loves singing, she took part in the singing competition. She practised hard every day 3.______ she wanted to win the prize. On that day, the hall was crowded 4.______ the good weather and the exciting shows. 5.______ everyone was excited, the whole hall was full of laughter. I didn’t sing on the stage 6.______ I was a little nervous, but I still had a great time 7.______ my friends were with me. The music festival must have been a great success, 8.______ so many students were talking about it. 9.______ we all love music, our class has decided to start a music club. 10.______ everyone supports the idea, we will make it come true. 参考答案与解析（教师用） 评分说明：单项选择、选词填空、语篇填空每空1分；句型转换、完成句子每小题2分（结构正确得1分、表达正确得1分）。满分50分。 一、单项选择（每小题1分，计10分） 1. A　解析：why问句只能用because回答；since（既然）与as（由于）引导已知或显而易见的原因，不能回答why。（原卷题改编） 2. A　解析：he had a bad cold是完整从句，用because；because of后接名词短语；so与句意不符。（原卷题改编） 3. B　解析：since“既然”，引出双方已知的原因，常放句首。（原卷题改编） 4. A　解析：as“由于”，说明显而易见的客观原因，常放句首。（依据教材例句） 5. A　解析：for表推测依据，语气最弱，只能放在主句之后；由“脸色苍白”推测他病了。（原卷题改编） 6. B　解析：the bad weather是名词短语，用because of。（原卷题改编） 7. C　解析：回答why的提问只能用because；since与as不能用来回答why的提问。对应易错点。 8. A　解析：the traffic was heavy是完整句子（主语＋谓语），用because；because of后接名词短语。（改编自23-24学年江苏宿迁期末真题） 9. A　解析：英语中because与so只能保留其一，不能同时出现。对应易错点“because与so不能连用”。 10. A　解析：helping the boy是动名词短语，用because of；注意because of后接动名词的用法。（提高题） 二、用方框中所给词填空（每空1分，计10分） 1. because 2. Since 3. because of 4. for 5. As 6. because 7. Since 8. because of 9. because 10. for 【解析】because后接完整句子，表直接原因；because of后接名词或动名词短语；since（既然）与as（由于）引出已知或显而易见的原因，常放句首；for表推测依据，只能放在主句之后。第2、5、7空填Since或As均可。 三、句型转换（每小题2分，计10分） 1. because of the heavy traffic 2. because I was 3. Because of 4. Why can 5. It must have rained last night, for the ground was wet. 【解析】第1题because引导的从句可改为because of加名词短语：because the traffic was heavy＝because of the heavy traffic；第3题回答why的提问可用because of加名词短语；第4题对原因状语提问用why；第5题for只能放在主句之后，对应易错点“for放句首”。 四、根据汉语提示完成句子（每小题2分，计10分） 1. because; was 2. Since 3. because of the heavy rain 4. for 5. As 【解析】第1题because引导原因状语从句，从句谓语用was；第4题for表推测依据，补充说明主句；第5题as表“由于”，放句首。 五、语篇填空（每空1分，计10分） 1. because 2. Since/As 3. because 4. because of 5. Since/As 6. because 7. because 8. for 9. Since/As 10. Since/As 【解析】第1、3、6、7空为直接原因，用because；第4空the good weather and the exciting shows是名词短语，用because of；第2、5、9、10空为已知或显而易见的原因，填Since或As均可；第8空根据“很多学生都在谈论”推测音乐节很成功，用for表推测依据。 学科网（北京）股份有限公司 $