Unit 1 Teenagers today 语法Grammar 条件状语从句和原因状语从句-2026-2027学年九年级英语上册单元练习（外研版）

**基本信息** 聚焦初中英语条件状语从句和原因状语从句单元复习，通过30道单选和10道完成句子题，系统考查if/unless/because等引导词的用法及“主将从现”等时态规则，适配单元核心语法巩固需求。 **题型特征** |题型|题量/分值|知识覆盖|命题特色| |----|-----------|----------|----------| |单项选择|30题/60分|条件状语从句（if/unless）、原因状语从句（because/as/since/for）的辨析及时态规则|以青少年学习生活为情境（如参加派对、完成任务），通过语境辨析引导词差异，提升语言运用能力| |完成句子|10题/40分|句型转换（if改写、同义句）、汉译英（含原因/条件表达）|结合“艺术传承”“健康生活”等主题，考查语法规则的灵活应用，培养逻辑思维与表达准确性|

学校:___________姓名：___________班级：___________考号：___________ Unit 1 Teenagers today 条件状语从句和原因状语从句 （时间：60分钟，满分：100分） 条件状语从句 if 如果 If you come to the party, you’ll have a great time! unless（if...not） 除非 You will be late again unless you hurry. 【注意】 1. 条件状从的时态：①主将从现 ②主情从现 ③主祈从现 原因状语从句 because 因为 直接加未知的原因，语气最强，常用来回答 why 引起的提问 It was because he was late that he didn’t go with us. as 因为；由于 语气最弱，常放于主句前，较口语化，所表达的原因比较明显 As you are a child, you can’t drive a car. since 既然 语气较弱，常放于主句前，表示对方已知的事实 Since he can't answer this question, you’d better ask someone else. for 因为 表示推断的理由是对前面分句加以解释，只能后置 Amy went to bed early, for she didn’t feel well. 【注意】 若强调原因状语从句，只能用 because 引导 一、单项选择(本大题共30小题，每小题2分，共60分) 1．________ he is interested in electronic music, he joined the music club. A．If B．Since C．For D．Though 2．________ you love singing, why not take part in the talent show? A．Because B．Since C．For D．As 3．________ you feel tired during study, you can stop to have a short rest to relax yourself. A．If B．Although C．Until D．Before 4．— ________ it’s difficult for you to complete the whole task in one go, try to divide it into small pieces and do them one by one. — Thank you for your advice. I’ll try it. A．Before B．If C．Unless D．Until 5．________ I don’t call you in the morning, it means there is no good news. A．But B．Although C．If D．So 6．I don’t know ________ he will come tomorrow. ________ he comes, I’ll tell you. A．if; Whether B．whether; Whether C．if; If D．if; That 7．You will get better grades ________ you study harder. A．if B．unless C．although D．until 8．Please keep quiet ________ you are in the library. A．if B．unless C．so 9．—________ you make a decision, you should take action at once. —Yes, actions speak louder than words. A．Unless B．Before C．If 10． ________ you have time this weekend, let’s go to the cinema. A．If B．Unless C．Though D．Until 11．He ________ much healthier if he ________ enough outdoor sports in free time. A．is; take B．will be; takes C．will be; will take D．is; will take 12．________ you feel too tired to finish all your plans, try making a stop-do list instead. A．If B．Until C．Although D．Unless 13．________ we work together, we can solve this problem easily. A．If B．Although C．Because D．Unless 14．—Eating too much junk food can harm your body, especially ________ you’re teenagers. —Yes. Junk food has a bad influence on our ability to think, learn and remember. A．If B．until C．although 15．________ you practice speaking English every day, your English will improve a lot. A．Although B．Until C．If D．So that 16．If you ________ tired, you ________ have a short rest first. A．feel; should B．will feel; should C．feel; would D．felt; would 17．He didn’t go to school yesterday ________ he had a bad cold. A．because B．because of C．so D．so that 18．—What do you think of digital books? —They are convenient, but I still prefer paper books ________ I can write notes on them. A．so B．because C．though D．if 19．He failed the exam ________ he was too careless. A．because B．while C．after D．until 20．She won’t go to the cinema ______ she has already seen the film. A．until B．if C．so D．because 21．— Why do you like group work? — ________ we can learn from each other. A．So B．Because C．But D．Though 22．I like him ________ he is very brave and smart. A．so B．because C．but D．though 23．Women wear qipao ________ it is a symbol of traditional beauty. A．so B．because C．and D．or 24．________ words are powerful, they can influence people’s opinions. A．Since B．But C．So D．Though 25．________ you are not feeling well, you don’t have to attend the speech. A．Since B．But C．So D．Though 26．________ you have already known the reasons, I won’t repeat them. A．Since B．But C．So D．Though 27．________ you have finished your homework, why not go out for a walk to relax? A．Since B．Unless C．Though D．Until 28．________ no one else saw the strange light, they couldn’t get anyone to believe them. A．Because of B．Since C．Unless D．But 29．________ you already know the truth, I won’t say anything more about it. A．Since B．Until C．Before D．Unless 30．________ over 400 million adults are too heavy, China has made a plan to help its people with weight control. A．Since B．Unless C．Until 二、完成句子(本大题共10小题，每小题4分，共40分) 31．如果年轻人对这门艺术感兴趣，它就会再次流行起来。 The art will be popular again ________ young people ________ ________ ________ it. 32．We must act now. Some arts will soon disappear. (用if改写) ________________________________________________ 33．如果你不快点，就会错过电影开场。 You will miss the beginning of the movie ________ you ________ hurry. 34．You’ll fail the exam unless you work hard.（改为同义句） ______ you ______ work hard, you’ll fail the exam. 35．Be careful, and you won’t make the same mistake again. (保持句意基本不变) ________ you ________ careful, you will make the same mistake again. 36．He will stay at home. It rains tomorrow.(用if合并为一句) He ________ stay at home if it ________ tomorrow. 37．He didn’t go to school because of his illness. (改为同义句) He didn’t go to school ________ ________ ________ ________. 38．我们不能去野餐，因为正在下很大雨。 We can’t go for a picnic ___________________________. 39．既然这个项目很有价值，为何不尽快开展呢？ Why don’t you ____________________ it is of great value? 40．You have finished your task. You can leave earlier. (用since合并两个简单句) ________________________________________________________________ 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $ 学校:___________姓名：___________班级：___________考号：___________ Unit 1 Teenagers today 条件状语从句和原因状语从句 （时间：60分钟，满分：100分） 条件状语从句 if 如果 If you come to the party, you’ll have a great time! unless（if...not） 除非 You will be late again unless you hurry. 【注意】 1. 条件状从的时态：①主将从现 ②主情从现 ③主祈从现 原因状语从句 because 因为 直接加未知的原因，语气最强，常用来回答 why 引起的提问 It was because he was late that he didn’t go with us. as 因为；由于 语气最弱，常放于主句前，较口语化，所表达的原因比较明显 As you are a child, you can’t drive a car. since 既然 语气较弱，常放于主句前，表示对方已知的事实 Since he can't answer this question, you’d better ask someone else. for 因为 表示推断的理由是对前面分句加以解释，只能后置 Amy went to bed early, for she didn’t feel well. 【注意】 若强调原因状语从句，只能用 because 引导 一、单项选择(本大题共30小题，每小题2分，共60分) 1．________ he is interested in electronic music, he joined the music club. A．If B．Since C．For D．Though 【答案】B 【详解】句意：因为他对电子音乐感兴趣，所以他加入了音乐俱乐部。 If如果；Since因为/由于；For因为；Though虽然。根据前后句逻辑可知，“对电子音乐感兴趣”是“加入音乐俱乐部”的原因/背景依据。For作连词表原因时，通常不放在句首，而是放在主句之后作为补充说明。Since侧重基于已知事实/背景的顺理成章推导（语气贴合“因兴趣而加入俱乐部”的逻辑），因此选Since。 2．________ you love singing, why not take part in the talent show? A．Because B．Since C．For D．As 【答案】B 【详解】句意：既然你喜欢唱歌，为什么不参加才艺表演呢？ Because（因为），侧重直接回答why提出的问题；Since（既然），引导已知、显而易见的原因，常置于句首；For（因为），并列连词，不能放在句首；As（由于），语气较弱。本句是基于已知事实给出建议，since表示“既然”，符合语境，因此应选Since。 3．________ you feel tired during study, you can stop to have a short rest to relax yourself. A．If B．Although C．Until D．Before 【答案】A 【详解】句意：如果你在学习中感到疲惫，可以停下来短暂休息放松自己。 考查连词辨析。if如果；although虽然；until直到；before在……之前。假设情境给出建议，选A。 4．— ________ it’s difficult for you to complete the whole task in one go, try to divide it into small pieces and do them one by one. — Thank you for your advice. I’ll try it. A．Before B．If C．Unless D．Until 【答案】B 【详解】句意：——如果一次性完成整个任务对你来说很难，试着把它分成小块并逐个完成。——谢谢你的建议。我会试试的。 Before在……之前；If如果；Unless除非；Until直到。根据答语“Thank you for your advice.”可知上句是在提建议，结合句意可知前后句为条件关系，表示“如果”很难就拆分任务，所以用If。 5．________ I don’t call you in the morning, it means there is no good news. A．But B．Although C．If D．So 【答案】C 【详解】句意：如果我早上不给你打电话，那就意味着没有好消息。 But但是；Although虽然；If如果；So所以。前后句存在条件逻辑关系，前句是假设条件，后句是该条件下的结果，应填If。 6．I don’t know ________ he will come tomorrow. ________ he comes, I’ll tell you. A．if; Whether B．whether; Whether C．if; If D．if; That 【答案】C 【详解】句意：我不知道他明天是否会来。如果他来了，我会告诉你。 if和whether都有“是否”的意思，引导宾语从句时一般可以互换；if还有“如果”的意思，引导条件状语从句。第一空，根据“I don’t know...he will come tomorrow.”可知，此处是不知道他明天“是否”会来，用if或whether均可；第二空，根据“...he comes, I’ll tell you.”可知，此处是“如果”他来就告诉“我”，用if引导条件状语从句。 7．You will get better grades ________ you study harder. A．if B．unless C．although D．until 【答案】A 【详解】句意：如果你更加努力学习，你就会取得更好的成绩。 if如果；unless除非；although尽管；until直到。“you study harder”是“You will get better grades”肯定条件，应用if引导条件状语从句。 8．Please keep quiet ________ you are in the library. A．if B．unless C．so 【答案】A 【详解】句意：请保持安静，如果你在图书馆。 考查连词辨析。if如果；unless除非；so因此。根据“Please keep quiet…you are in the library.”可知，在图书馆应保持安静是一种条件关系，“如果在图书馆”符合逻辑。故选A。 9．—________ you make a decision, you should take action at once. —Yes, actions speak louder than words. A．Unless B．Before C．If 【答案】C 【详解】句意：——如果你做了决定，就应该立刻行动。——是的，行动胜于雄辩。 考查连词辨析。Unless除非；Before在……之前；If如果。根据“you make a decision, you should take action at once”可知，此处强调“一旦做出决定，就应立刻行动”，此处表示条件关系，应选用表示假设的连词“If”。故选C。 10． ________ you have time this weekend, let’s go to the cinema. A．If B．Unless C．Though D．Until 【答案】A 【详解】句意：如果你这周末有时间，我们去看电影吧。 考查连词辨析。If如果；Unless除非；Though虽然；Until直到。由于前半句“you have time”是后半句“go to the cinema”的条件，应使用表示“如果”的连词引导条件状语从句。故选A。 11．He ________ much healthier if he ________ enough outdoor sports in free time. A．is; take B．will be; takes C．will be; will take D．is; will take 【答案】B 【详解】句意：如果他空闲时间做足够的户外运动，他会健康得多。 句子含有if引导的条件状语从句，需遵循“主将从现”的原则，主句用一般将来时（will be），从句用一般现在时（takes）。 12．________ you feel too tired to finish all your plans, try making a stop-do list instead. A．If B．Until C．Although D．Unless 【答案】A 【详解】句意：如果你感到疲惫无法完成所有计划时，试试制定一份停止事项清单。 If如果；Until直到；Although虽然；Unless除非。根据后半句“try making a stop-do list instead”可知，前半句是假设的条件，应填If。 13．________ we work together, we can solve this problem easily. A．If B．Although C．Because D．Unless 【答案】A 【详解】句意：如果我们一起合作，我们就能轻而易举地解决这个问题。 If如果；Although尽管；Because因为；Unless除非。根据“we can solve this problem easily”可知，前后句是条件关系，表示“如果”我们一起工作，就能解决问题，应用if引导条件状语从句。应填If。 14．—Eating too much junk food can harm your body, especially ________ you’re teenagers. —Yes. Junk food has a bad influence on our ability to think, learn and remember. A．If B．until C．although 【答案】A 【详解】句意：——吃太多垃圾食品会伤害你的身体，特别是如果你还是青少年的话。——是的。垃圾食品对我们的思考、学习和记忆能力有不良影响。 If如果；until直到……为止；although尽管。根据后句“你是青少年”是前句“吃垃圾食品伤身”的特定条件，此处表示条件关系，强调如果是青少年，吃垃圾食品的危害尤其大，If符合语境。 15．________ you practice speaking English every day, your English will improve a lot. A．Although B．Until C．If D．So that 【答案】C 【详解】句意：如果你每天练习说英语，你的英语将会提高很多。 Although虽然；Until直到；If如果；So that以便。前半句“每天练习说英语”是后半句“英语将会提高很多”的条件，用if引导条件状语从句。 16．If you ________ tired, you ________ have a short rest first. A．feel; should B．will feel; should C．feel; would D．felt; would 【答案】A 【详解】句意：如果你感到累了，你应该先短暂休息一下 should应该；would将会。在if引导的条件状语从句中，主句用一般将来时或“情态动词+动词原形”，从句用一般现在时表将来。从句主语you，谓语应用feel（一般现在时）。主句表示建议或应该做某事，应用should。 17．He didn’t go to school yesterday ________ he had a bad cold. A．because B．because of C．so D．so that 【答案】A 【详解】句意：他昨天没去上学，因为他得了重感冒。 because表示原因，后接从句；because of后接名词或短语；so表示结果；so that表示目的。根据空后“he had a bad cold”是完整句子且表示没去上学的原因，可知应用because引导原因状语从句。 18．—What do you think of digital books? —They are convenient, but I still prefer paper books ________ I can write notes on them. A．so B．because C．though D．if 【答案】B 【详解】句意：——你觉得电子书怎么样？——它们很方便，但我仍然更喜欢纸质书，因为我可以在上面做笔记。 so所以；because因为；though虽然；if如果。根据语境可知，“我可以在上面做笔记”是“我仍然更喜欢纸质书”的原因，表示因果关系中的原因，应用because引导原因状语从句。 19．He failed the exam ________ he was too careless. A．because B．while C．after D．until 【答案】A 【详解】句意：他考试不及格，因为他太粗心了。 because因为；while当……时候/然而；after在……之后；until直到……。根据“He failed the exam"和"he was too careless”可知，前后句是因果关系，“太粗心”是“考试不及格”的原因。故选A。 20．She won’t go to the cinema ______ she has already seen the film. A．until B．if C．so D．because 【答案】D 【详解】句意：她不会去看电影，因为她已经看过这部电影了。 until直到；if如果；so因此；because因为。根据“She won’t go to the cinema... she has already seen the film.”，空前“她不会去看电影”，空后“她已经看过这部电影了”，前面是结果，后面是原因，应填because。 21．— Why do you like group work? — ________ we can learn from each other. A．So B．Because C．But D．Though 【答案】B 【详解】句意：—— 你为什么喜欢小组合作？—— 因为我们可以互相学习。 So所以；Because因为；But但是；Though虽然。根据问句“Why”可知是询问原因，答语应用Because来回答。 22．I like him ________ he is very brave and smart. A．so B．because C．but D．though 【答案】B 【详解】句意：我喜欢他，因为他勇敢又聪明。 so所以；because因为；but但是；though虽然/尽管。后半句 “他既勇敢又聪明” 是前半句 “我喜欢他” 的原因，填because。 23．Women wear qipao ________ it is a symbol of traditional beauty. A．so B．because C．and D．or 【答案】B 【详解】句意：女性穿旗袍，因为它是传统美的象征。 so所以；because因为；and和；or或者。根据“a symbol of traditional beauty”可知这是穿旗袍的原因，前后句是因果关系，且后句表原因，因此填写“because”。 24．________ words are powerful, they can influence people’s opinions. A．Since B．But C．So D．Though 【答案】A 【详解】句意：因为话语很有力量，它们能够影响人们的观点。 Since既然/因为；But但是； So所以； Though虽然，前半句“话语很有力量”是后半句“能影响人们观点”的原因，Since可引导原因状语从句契合逻辑；But表转折关系、So表因果但要放在结果分句前、Though表让步关系，三者都不符合本题语境逻辑。 25．________ you are not feeling well, you don’t have to attend the speech. A．Since B．But C．So D．Though 【答案】A 【详解】句意：既然你感觉不舒服，你就不必去参加演讲了。 Since既然；But但是；So所以；Though虽然。根据“you are not feeling well”是“you don't have to attend the speech”的原因，可知此处表示因果关系，Since引导原因状语从句符合语境。 26．________ you have already known the reasons, I won’t repeat them. A．Since B．But C．So D．Though 【答案】A 【详解】句意：因为你已经知道了原因，我就不再重复了。 Since既然 (表示已知原因)；But但是 (转折)；So所以 (结果)；Though虽然 (让步)。根据“you have already known the reasons” (你已经知道了原因) 可知，这是已知的因果关系，应用“Since”引导原因状语从句。 27．________ you have finished your homework, why not go out for a walk to relax? A．Since B．Unless C．Though D．Until 【答案】A 【详解】句意：既然你已经完成了你的作业，为什么不出去散步放松一下呢？ Since既然；Unless除非；Though尽管；Until直到……为止。根据“you have finished your homework, why not go out for a walk to relax?”可知，此处表示“既然”完成了作业，就可以出去散步放松，应填Since。 28．________ no one else saw the strange light, they couldn’t get anyone to believe them. A．Because of B．Since C．Unless D．But 【答案】B 【详解】句意：因为没有其他任何人看到那道奇怪的光，他们无法让任何人相信他们。 Because of因为（后接名词或短语）；Since既然；因为（后接句子）；Unless除非；But但是。分析句子可知，空格后为完整主谓句，Because of是介词短语，不能接句子，故排除；结合句意，前后是因果逻辑，Since可引导原因状语从句，符合要求。 29．________ you already know the truth, I won’t say anything more about it. A．Since B．Until C．Before D．Unless 【答案】A 【详解】句意：既然你已经知道真相了，我就不再多说这件事了。 Since既然，引导原因状语从句；Until直到，引导时间状语从句，表示动作持续到某一时间；Before在……之前，引导时间状语从句；Unless除非，引导条件状语从句。“you already know the truth, I won’t say anything more about it”表示不再多说这件事的原因，应填Since。 30．________ over 400 million adults are too heavy, China has made a plan to help its people with weight control. A．Since B．Unless C．Until 【答案】A 【详解】句意：因为超过四亿成年人超重，中国已经制定了一项计划来帮助人们控制体重。 Since因为；Unless除非；Until直到……为止。前半句“adults are too heavy”是后半句“made a plan to help”的原因，Since在此引导原因状语从句，符合逻辑。 二、完成句子(本大题共10小题，每小题4分，共40分) 31．如果年轻人对这门艺术感兴趣，它就会再次流行起来。 The art will be popular again ________ young people ________ ________ ________ it. 【答案】 if are interested in 【详解】原句中“如果”和“对……感兴趣”是关键词，表示“如果”的单词是“if”，引导条件状语从句，遵循“主将从现”原则，主句是一般将来时（will be），if 引导的从句需用一般现在时。表示“对……感兴趣”的短语是be interested in，从句主语young people是复数，因此be动词用are。故填if；are；interested；in。 32．We must act now. Some arts will soon disappear. (用if改写) ________________________________________________ 【答案】If we don’t act now, some arts will soon disappear. 【详解】句意：我们必须现在就行动。有些艺术将很快消失。用if改写，应用if引导条件状语从句，遵循“主将从现”原则，句子可表达为“如果我们现在不采取行动，一些艺术将很快消失”；从句是否定句，主语是we，谓语是don’t act，时间状语是now；主句中，主语是some arts，谓语是will disappear，副词soon作状语。 33．如果你不快点，就会错过电影开场。 You will miss the beginning of the movie ________ you ________ hurry. 【答案】 if don’t 【详解】根据中文对照可知，第①空缺少“如果”，if“如果”，引导条件状语从句；第②空缺少“不”，if条件句中，主句用一般将来时，从句用一般现在时，而从句中已有谓语动词“hurry”，需用助动词don’t表达否定。故填if；don’t。 34．You’ll fail the exam unless you work hard.（改为同义句） ______ you ______ work hard, you’ll fail the exam. 【答案】 If don’t 【详解】句意：除非你努力学习，否则你会考试不及格。原句中的“unless”表示“除非”，相当于“if…not…”结构。因此，“You’ll fail the exam unless you work hard.”可以改写为“If you don’t work hard, you’ll fail the exam.”，两者都表示“如果不努力，就会考试不及格”。故填If；don’t。 35．Be careful, and you won’t make the same mistake again. (保持句意基本不变) ________ you ________ careful, you will make the same mistake again. 【答案】 If aren’t 【详解】句意：小心点，这样你就不会再犯同样的错误了。分析题干可知，句子可以改成if引导的条件状语从句，即“如果你不细心，你会犯同样的错误”；主句为一般将来时，则从句用一般现在时；if位于句首，首字母要大写；主语you为第二人称，be用are，与not缩写为aren’t。故填If；aren’t。 36．He will stay at home. It rains tomorrow.(用if合并为一句) He ________ stay at home if it ________ tomorrow. 【答案】 will rains 【详解】句意：他将待在家。明天下雨。改为含有“if”的主从复合句。由于“if”如果，遵循主将从现。所以第一空是will，第二空前主语是“it”，所以是动词三单rains。故填will；rains。 37．He didn’t go to school because of his illness. (改为同义句) He didn’t go to school ________ ________ ________ ________. 【答案】 because he was ill 【详解】句意：他因为生病没有去上学。原句中“because of his illness”表示原因，其中“because of”是介词短语，后接名词或名词短语。改为同义句时，需要用“because”引导原因状语从句，“because”后接完整的句子，根据原句时态为一般过去时，所以从句中谓语动词用“was”，即“because he was ill”，其他部分保持不变。故填because；he；was；ill。 38．我们不能去野餐，因为正在下很大雨。 We can’t go for a picnic ___________________________. 【答案】because it’s raining hard 【详解】根据句意可知，此句为现在进行时，because：因为；it’s raining hard：正在下很大雨，故填because it’s raining hard。 39．既然这个项目很有价值，为何不尽快开展呢？ Why don’t you ____________________ it is of great value? 【答案】carry out the project as soon as possible since 【详解】carry out“实施，开展”，the project“这个项目”；as soon as possible“尽快”；since“既然”，引导原因状语从句，固定句式：Why don’t you do sth“你为什么不做某事”，故填carry out the project as soon as possible since。 40．You have finished your task. You can leave earlier. (用since合并两个简单句) ________________________________________________________________ 【答案】Since you have finished your task, you can leave earlier. 【详解】句意：你已经完成了你的任务，你可以提前离开。将两个简单句用“since”合并为一个复合句，表达因果关系。since作连词，意为“既然；由于”，用于引导原因状语从句。合并后保持原句的现在完成时（have finished）和情态动词（can）不变。故填Since you have finished your task, you can leave earlier. 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $