
/ 让学习更有效 新课备课备考 | 英语学科 2025年人教新目标版九年级英语上册精讲精练 Unit 12 Life is full of the unexpected. 核心语法:时间状语从句 一、 核心概念 定义: 在复合句中,充当时间状语的从句。它用来说明主句动作发生的时间。 功能: 回答“When... ”(什么时候?)的问题。 结构: 从属连词 + 主语 + 谓语 关键: 掌握不同的从属连词,是学好时间状语从句的第一步。 二、 常用从属连词及用法 1. 表示“当…时候” when: 既可指“时间点”(从句用短暂性动词),也可指“时间段”(从句用持续性动词)。用法最广。 When the teacher came in, we were reading. (老师进来时,我们正在看书。) I was watching TV when my mother called me. (我妈妈给我打电话时,我正在看电视。) while: 只能指“时间段”,强调主句和从句的动作同时发生,且从句动词必须是持续性动词。 While we were having a meeting, the lights went out. (我们正在开会时,灯灭了。) Please don't talk so loud while others are working. (别人在工作时,请勿大声喧哗。) as: 强调“一边…一边…”,表示两个动作伴随发生。 He sang songs as he walked. (他一边走路一边唱歌。) As she grew older, she became more confident. (随着她长大,她变得更自信了。) 三词辨析小结: 连词 侧重 从句动词特点 when 时间点或时间段 短暂性或持续性动词均可 while 时间段 必须是持续性动词 as 动作伴随 持续性动词 2. 表示“在…之前/之后” before: “在…之前” Think before you leap. (三思而后行。) He had left before I could thank him. (我还没来得及谢他,他就走了。) after: “在…之后” After he finished his homework, he went out to play. (他做完作业后,就出去玩了。) 3. 表示“直到…” till / until: “直到…为止” 肯定句:主句动词必须是持续性动词,表示动作持续“到…为止”。 I waited until the rain stopped. (我一直等到雨停。) 否定句:主句动词是短暂性动词,构成“not...until...”结构,表示“直到…才…”,这是中考重中之重。 I did not go to bed until my father came back last night. (昨晚我直到爸爸回来才睡觉。) 4. 表示“一…就…” as soon as: 最常用。 I will call you as soon as I arrive. (我一到就给你打电话。) the moment / the minute / immediately: 语气更强,更书面化。 I recognized her the moment I saw her. (我一见到她就认出她了。) 5. 表示“自从…” since: “自从…以来” 主句常用现在完成时,从句用一般过去时。 He has lived here since he was born. (他自从出生就住在这里。) It has been three years since we last met. (我们自从上次见面已有三年了。) 三、 时间状语从句的时态:主将从现 这是时间状语从句最核心的语法规则,也是中考的必考点。 规则: 当主句是一般将来时(will, be going to)、祈使句或含有情态动词(can, may, must)表示将来意义时,时间状语从句必须用一般现在时来表示将来。 例句: I will tell him the news when he comes back. (他回来时,我会告诉他这个消息。) As soon as the rain stops, we will go out. (雨一停,我们就出去。) Don't forget to turn off the lights before you leave. (你离开前别忘了关灯。) You can watch TV after you finish your homework. (你做完作业后可以看电视。) 特别注意: 这里的“现”指的是一般现在时,不是现在进行时。 如果主句是过去将来时(would do),则从句用一般过去时,即“主过从过”。 He said he would call me when he arrived. (他说他到 ... ...
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