冀教版八年级下册Unit 2 Safety单元语法知识梳理与练习（原卷版＋解析版）

冀教版八年级下册Unit 2单元语法知识梳理与练习 一：单元语法知识梳理 (Unit 2 Safety) 一、过去进行时 (Past Continuous Tense) 的概念与结构 【规则变化】 过去进行时表示在过去某一时刻或某一段时间内正在进行或发生的动作。通常与表示过去某个具体时间的时间状语连用。 结构：主语 + was / were + 动词-ing + 其他. (当主语是 I, he, she, it 或单数名词时，用 was；当主语是 we, you, they 或复数名词时，用 were。) 【注意】 常见的时间状语标志词有：at this time yesterday (昨天这个时候), at 8:00 last night (昨晚8点), then (那时), at that time (在那时), 以及由 when/while 引导的时间状语从句。 【例句】 I was reading a book about safety at 8:00 last night. 昨晚8点我正在看一本关于安全的书。 They were putting out a fire at that time. 那时他们正在灭火。 二、过去进行时的句式变化 【规则变化】 1. 否定句：主语 + was / were + not + 动词-ing + 其他. (was not 缩写为 wasn't；were not 缩写为 weren't)。 2. 一般疑问句：Was / Were + 主语 + 动词-ing + 其他 肯定回答：Yes, 主语 + was/were. 否定回答：No, 主语 + wasn't/weren't. 3. 特殊疑问句：特殊疑问词 + was / were + 主语 + 动词-ing + 其他 【例句】 He wasn't running down the stairs when I saw him. 当我看到他时，他并没有跑下楼梯。 — Were you learning first aid at 10:00 yesterday morning 昨天上午10点你们在学急救吗？ — Yes, we were. / No, we weren't. 是的，我们在学。 / 不，我们没学。 What were you doing when the earthquake happened 地震发生时你在做什么？ 三、when 与 while 在过去进行时中的区别与应用 【规则变化】 1. when (当……时)：引导的从句动词既可以是短暂性动词，也可以是延续性动词。常用于“主句(过去进行时) + when + 从句(一般过去时)”的结构中，表示在一个动作进行的过程中，另一个突然发生的短暂动作。 2. while (在……期间)：引导的从句动词必须是延续性动词，强调主句和从句的动作同时发生。常用于“主句(过去进行时) + while + 从句(过去进行时)” 或 “主句(一般过去时) + while + 从句(过去进行时)”。 【本单元核心短语】 in case / in case of 以防万一 / 如果，假设 put out a fire 灭火 first aid 急救 in emergency 在紧急情况下 all of a sudden 突然 in pain 感到疼痛 in a hurry 匆忙地 be late for 迟到 in shock 处于震惊中 【例句】 We were talking about safety education when the teacher came in. 老师进来时，我们正在谈论安全教育。 While I was waiting for the bus, it began to rain. 我等公交车时，天开始下雨了。 All of a sudden, a car hit the tree. 突然，一辆汽车撞到了树上。 二：单元语法知识练习 I. 单项选择（10道） 1. — I called you at 8:00 last night, but you didn't answer. — Sorry, I _____ about safety rules with my parents. A. am talking B. was talking C. talk D. talked 2. He fell off his bike _____ he was riding down the street. A. before B. while C. after D. as soon as 3. Take an umbrella with you just in _____ it rains. A. order B. time C. case D. hurry 4. The brave firemen successfully put _____ the big fire and saved the people. A. up B. on C. off D. out 5. They _____ doing first aid when the teacher came in. A. was B. were C. are D. did 6. I was late _____ school this morning because my bike was broken. A. for B. to C. with D. in 7. _____ of a sudden, a dog ran acro ... ...