【弯道超车】Module 4 Home alone 核心语法之原因状语从句-2025年外研版九年级英语上册精讲精练 (含答案解析)

/ 让学习更有效 新课备课备考 | 英语学科 / 让学习更有效 新课备课备考 | 英语学科 2025年外研版九年级英语上册精讲精练 Module 4 Home alone 核心语法：原因状语从句 一、核心概念 原因状语从句 用来表示主句中动作或状态发生的原因或理由，回答“为什么”的问题。 引导词：because, since, as, now that 等 二、常用引导词辨析 引导词 语气强度 位置 用法特点 例句 because ★★★★★ （最强） 句首或句末 直接说明原因，回答why提问 I stayed home because it was raining. since ★★★★ （较强） 句首 表示显而易见或已知的原因 Since you are busy, I'll come later. as ★★★ （较弱） 句首 原因较明显，语气较随意 As it's getting late, we should go. now that ★★★★ （较强） 句首 表示“既然，由于”（现在已存在的状况） Now that you are here, let's begin. 三、基本句型结构 主句 + because + 从句 He didn't come to school because he was ill. Since/As/Now that + 从句，主句 Since everyone is here, let's start the meeting. As you insist, I'll change my plan. Now that you understand, we can move on. 四、注意事项 1、because 与 so 不能连用 Because it was raining, so we stayed home. Because it was raining, we stayed home. It was raining, so we stayed home. 2、语气强弱的选择 重要原因用 because 众所周知的原因用 since 或 as 现在的状况用 now that 3、标点符号的使用 从句在前时，用逗号与主句隔开 从句在后时，一般不用逗号 五、易错点分析 1、引导词混淆 Because everyone is here, let's begin.（语气过强） Since everyone is here, let's begin. 2、中文思维影响 Because he is tired, so he wants to rest. Because he is tired, he wants to rest. 3、now that 的误用 Now that he was ill, he didn't come.（过去时态不适用） Now that he is ill, he can't come. 六、记忆口诀 “原因从句表原因，because since as 常见。 because 语气最强烈，回答why 它来解。 since as 语气轻，已知原因用它引。 now that 表既然，现在状况是前提。 切记because so 不同现，时态一致要记全。” 1．Mary thinks geography is really difficult, _____ she doesn’t like it. A．but B．because C．so D．and 2．-- Why were you late for school this morning -- I was ill, and had to see a doctor first. A．As B．Since C．Because D．For 3．He likes science _____ it’s very interesting. A．and B．so C．because D．but 4．We are very proud（自豪的）_____ China is becoming stronger and stronger. A．or B．because C．so D．though 5．The firefighters have to eat breakfast very fast _____ they don’t have much time. A．so B．and C．because D．but 6．He failed the exam _____ he was too careless. A．because B．but C．so that D．so 7．I don’t like the T-shirt _____ it’s too big for me. A．so B．but C．when D．because 8．We are making a big cake, _____ it’s Dad’s birthday today. A．because B．or C．so D．but 9．—Why do you like science —_____ I think it’s interesting. A．And B．So C．But D．Because 10．Music is my favorite subject____ it is interesting. A．but B．because C．so D．or 11．I don’t like winter _____ it’s too cold. A．and B．but C．or D．because 12．I don’t like fast food _____ it is not healthy. A．but B．so C．because 13．Her favorite day is Saturday _____ she has mus ... ...