内容正文:
Unit 7 Be a Better Learner! -同步【语法】-时间状语从句-复习和练习
【同步知识复习】
一、本课总重点知识总结
(一)核心概念
时间状语从句由时间连词引导,交代主句动作发生的时间,从句可放句首 / 句末;从句放句首,逗号隔开主从句;放句末无需逗号。
(二)引导连词分类+用法
1. when /while/as 当…… 时
· when:短暂动词、延续动词均可,时间点 / 时间段通用;短暂突发动作用 when,搭配一般过去时。
· while:仅搭配延续性动词,常使用进行时,主从句同步长动作同时发生。
· as:口语化,强调动作一边发生、一边伴随。
2. before 在…… 之前 /after 在…… 之后
before:从句动作后发生;after:从句动作先完成,均遵循主将从现。
3. until /till 直到…… 为止
肯定句:主句动词为延续动词,动作持续到从句发生;
固定必考:not…until 直到…… 才。
4. as soon as 一…… 就……
两个动作紧密衔接,从句动作结束立刻发生主句动作,严格主将从现。
二、Activity 精讲
Activity1
表格填空原文+答案
1. I was working on a math problem when the bell rang.
句意:铃响的时候,我正在算一道数学题。
解析:rang(铃响)是短暂性动作,打断前面持续进行的动作;while 后只能接延续动作,短暂时间点只能用 when。故填 when
2. I’m taking notes while they are discussing in groups.
句意:他们小组讨论的时候,我正在记笔记。
解析:主句、从句都是现在进行时,两段同步持续进行的动作,只能用 while。故填 while
3. I often search for information online before I cook a new dish.
句意:我做新菜之前,经常上网查资料。
解析:查资料发生在做菜之前,before 表示 “在…… 之前”。故填 before
4. We went home after we finished our homework.
句意:我们写完作业之后回家了。
解析:写完作业的动作先完成,之后才回家,after 表示 “在…… 之后”。故填 after
5. I didn’t understand the meaning of “socialism” until I looked it up in the dictionary.
句意:我查了字典才明白 “社会主义” 的含义。
解析:固定结构 not…until,意为 “直到…… 才”;后半句 looked 为一般过去时,前半句时态统一,否定用 didn’t + 动词原形 understand。故填 didn’t understand;until
Activity2
1. While Li Xiang is watching TV, Liu Mei is doing her homework.
句意:李翔看电视的时候,刘梅正在写作业。
解析:while 引导两段同步进行的动作,前半句 is watching 是现在进行时,后半句保持 be doing 结构,do 变形为 doing。故填 doing her homework
2. After Jim gets up in the morning, he always brushes his teeth first.
句意:吉姆早上起床后,他总是先刷牙。
解析:always 是一般现在时标志;主语 he 是第三人称单数,brush 变为三单 brushes。故填 brushes his teeth
3. I will wash the apple before I eat it.
句意:吃苹果之前我会先洗一下苹果。
解析:will 是情态助动词,后面必须接动词原形。故填 wash the apple
4. When I came back, my grandma was watering the flowers.
句意:我回来的时候,奶奶正在浇花。
解析:when 引导过去时间点,主句用过去进行时 was doing,water 变形为 watering。故填 watering the flowers
【同步知识练习】
基础层
1、 选词填空
when while as before after until as soon as
1. ____ I walk into the classroom, the class begins.
2. I will pack my luggage ____ I take a trip.
3. She sang ____ she washed clothes.
4. I won’t stop reading ____ I finish the whole book.
5. My mom was cooking ____ my dad was watching news.
2、 单项选择
( ) 1.【2023 湖南中考】I’ll send you a message ____ I get to the station.
A. as soon as B. while C. until D. though
( ) 2.【2024 河南中考】My sister was drawing ____ I was doing my homework.
A. when B. while C. if D. because
( ) 3.【2022 河北改编】He didn’t go home ____ the sun went down.
A. when B. after C. until D. before
( ) 4.【2023 四川中考】You should finish your homework ____ you watch cartoons.
A. after B. before C. while D. as soon as
( ) 5.【2024 湖北改编】____ the rain stops, we will go out for a walk.
A. As soon as B. While C. Until D. As
( ) 6.I met an old friend ____ I walked on the street.
A. while B. when C. as D. before
( ) 7.____ she sang, all listeners cried.
A. As B. While C. Until D. Before
( ) 8.We often drink tea ____ we finish dinner.
A. before B. after C. while D. until
( ) 9.They waited ____ the concert ended.
A. when B. until C. while D. as soon as
( ) 10.Don’t speak ____ others finish their words.
A. while B. when C. before D. after
能力层
1、 判断改错(划出错误,横线改正)
1. While the bell ring, I was reading books. ________
2. I don’t go to bed as soon as my mother comes back. ________
3. Before he finish his task, he can’t play outside. ________
2、 句型改写
1. I finish my homework. I will go cycling.(用 as soon as 合并)
2. He didn’t stop working. It was midnight.(用 until 合并)
3. She was cleaning rooms. Her brother was playing games.(用 while 合并)
4. You can play outside. You clean your bedroom first.(用 before 改写)
5. I will call you. I arrive at the station.(替换 as soon as)
拓展层
1、 短文词形填空
Last Saturday, I made a plan for my day. 1._____ I get up every morning, I brush my teeth first. Last Saturday morning, 2._____ I washed fruit, my grandma 3._____ (water) flowers in the yard. I didn’t take a break 4._____ I finished all housework. My grandma said she would take me to the park 5._____ I cleaned the whole room. As soon as I 6._____ (finish) cleaning, we set off. While we 7._____ (walk) in the park, we met my primary school friend. It was a warm and happy Saturday.
2、 链式时间从句仿写
结构模板
Before A(一般现在时), I will B(一般将来时).
As soon as B(一般现在时), I will C(一般将来时).
Then, while C(现在进行时), I will D(一般将来时)……
写作要求:句子环环相扣,严格区分 when/while/as/before/after,主题:周末活动
参考答案和解析
基础层
一、选词填空
1. 答案:As soon as
句意:我一走进教室,上课铃就响了。
解析:as soon as 含义 “一…… 就”,强调两个动作立刻衔接;主句为一般现在时表常态,从句同样用一般现在时 walk,符合时态规则。
2. 答案:before
句意:旅行之前我会收拾行李。
解析:before 表示 “在…… 之前”,收拾行李这个动作发生在出行前面,符合事件先后逻辑。
3. 答案:as
句意:她一边洗衣服一边唱歌。
解析:as 侧重动作同步伴随,适合描述一边做一件事一边做另一件延续动作。
4. 答案:until
句意:不读完这本书我不会停止阅读。
解析:固定搭配 not…until,翻译为 “直到…… 才”,否定主句搭配 until 从句是八下必考结构。
5. 答案:while
句意:妈妈做饭的时候爸爸在看新闻。
解析:主从句都是过去进行时,两段同步持续动作,语法规定只能用 while 连接。
二、单项选择
1. 句意:我一到车站就给你发消息。
解析:第一步区分词义:as soon as 一…… 就;while 当…… 时;until 直到;though 虽然。第二步时态判断,主句 will 将来时,从句一般现在时,符合主将从现;两个动作紧密衔接,选用 as soon as。故选 A
2. 句意:我写作业时妹妹在画画。
解析:第一步排除无关连词 if(如果)、because(因为);第二步区分 when/while,两句均为过去进行时,代表同步延续动作,只能用 while。故选 B
3. 句意:直到日落他才回家。
解析:主句含有 didn’t 否定形式,匹配固定核心结构 not…until,意为直到…… 才,其余连词无法和否定主句搭配。故选 C
4. 句意:看动画片之前要写完作业。
解析:梳理事件顺序:先写作业,后看动画;before 表示在…… 之前,after 语义相反,while、as soon as 逻辑不匹配。故选 B
5. 句意:雨一停我们就出门散步。
解析:主句将来时,从句一般现在时;stop 是短暂动词,while 后只能接延续动词直接排除;until 逻辑不通,as 侧重伴随,as soon as 贴合 “一…… 就” 含义。故选 A
6. 句意:我在街上走时遇见老朋友。
解析:meet 遇见是短暂动作,while 只能搭配延续动词,直接排除;when 可同时搭配短暂、延续动作,语法符合要求。故选 B
7. 句意:她唱歌的时候,听众都落泪了。
解析:as 侧重动作同步伴随,一边唱歌一边落泪;while 侧重长时间持续动作,本句用 as 更贴合语境。故选 A
8. 句意:我们吃完晚饭后常会喝茶。
解析:动作先后顺序:先吃完饭,再喝茶,after 表示在…… 之后。故选 B
9. 句意:他们一直等到音乐会结束。
解析:wait 是延续性动词,until 表示动作持续到从句动作发生;as soon as“一…… 就” 逻辑不符。故选 B
10. 句意:别人说完话之前不要插话。
解析:语义逻辑:他人未说完,不能开口,before 表示在…… 之前,匹配句意。故选 C
能力层
一、判断改错(划出错误,横线改正)
1. 句意:铃响的时候我正在看书。
解析:第一步辨析连词:the bell ring 铃响属于短暂动作,while 仅搭配延续动词,连词使用错误;第二步时态规则:主句过去进行时,短暂突发动作用 when 引导。故划线while,故改:While→When
2. 句意:我等到妈妈回家才睡觉。
解析:主句带有否定 don’t,固定核心搭配 not…until 表示 “直到…… 才”;as soon as 意为 “一…… 就”,放入句中逻辑矛盾,连词搭配错误。故划线as soon as,故改:as soon as→until
3. 句意:完成任务前他不能出去玩。
解析:本句为主情从现结构,before 引导时间状语从句;主语 he 是第三人称单数,一般现在时谓语动词需变为三单形式 finishes,原形 finish 变形错误。故划线finish,故改:finish→finishes
二、句型改写
1. 句意:我写完作业就去骑车。
解析:as soon as 引导时间状语从句,遵循主将从现;从句放句首时末尾加逗号,从句主语 I 用动词原形 finish,主句 will + 动词原形。
故答案是 As soon as I finish my homework, I will go cycling.
2. 句意:他一直工作到午夜才停下。
解析:固定结构 not…until,把 it was midnight 作为 until 引导的从句,主句保留否定形式。
故答案是 He didn’t stop working until it was midnight.
3. 句意:她打扫房间时弟弟在打游戏。
解析:两句均为过去进行时,同步延续动作用 while 连接,while 置于句首,后加逗号。
故答案是 While she was cleaning rooms, her brother was playing games.
4. 句意:先打扫卧室才能出去玩。
解析:before 表示 “在…… 之前”,打扫房间动作在前,出去玩在后,主情从现。
故答案是 You can play outside before you clean your bedroom.
5. 句意:我一到车站就给你打电话。
解析:用 as soon as 连接两个分句,从句一般现在时,主句将来时。
故答案是 I will call you as soon as I arrive at the station.
拓展层
一、短文词形填空
【答案汇总】
1.After 2.While 3.was watering 4.until 5.as soon as 6.finished 7.were walking
【解析】
1. 句意:每天早上起床后我先刷牙。
解析:描述动作先后顺序,after 表示 “在…… 之后”,句首首字母大写。故填 After
2. 句意:上周六我洗水果时,奶奶在院子浇花。
解析:主从句都是过去进行时,两段同步延续动作,用 while。故填 While
3. 句意:奶奶当时正在院子里浇花。
解析:while 搭配过去进行时,grandma 为单数主语,be 动词用 was,water 变 watering。故填 was watering
4. 句意:我忙完所有家务才休息。
解析:主句否定 didn’t,固定搭配 not…until,译为直到…… 才。故填 until
5. 句意:奶奶说我打扫完房间就带我去公园。
解析:两个动作无缝衔接,as soon as 表示一…… 就。故填 as soon as
6. 句意:我一打扫完,我们就出发了。
解析:全文整体为过去时态,从句谓语动词 finish 变为过去式 finished。故填 finished
7. 句意:我们在公园散步时遇见老朋友。
解析:while 引导过去进行时,主语 we 是复数,be 动词用 were,walk 变 walking。故填 were walking
二、链式时间从句仿写
【参考范文】
Before I have breakfast tomorrow, I will finish my English exercise.
As soon as I finish the exercise, I will buy fresh vegetables for my family.
Then, while I am washing vegetables, I will listen to English listening materials.
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