26秋外研版九年级上册英语Unit 2 On the money单元语法 课件(共27张PPT)

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26秋外研版九年级上册英语Unit 2 On the money单元语法 课件(共27张PPT)

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(共27张PPT)
新外研版九上
Unit2单元语法
时间状语从句地点状语从句
2026
1.时间状语从句
如果我们用从句来表达一件事情或一个行为发生的时间,那么这个从句就叫时间状语从句。不同的引导词引导的时间状语从句的意思也不同。下面我们来看一下几种常见的时间状语从句:
(1)when引导的时间状语从句
when意为“当......的时候”既可以表示在某一时间点发生的事,又可以表示在某一时间段发生的事。主句与从句描述的动作或事情可以同时发生,也可以先后发生。例如:
When the weather is fine, many people go out for a walk.
天气时,很多人都出去散步。
When I got home, I found my baby girl singing in the sitting room.
我到家时,发现我的小女儿正在客厅里唱歌。
(2)as soon as引导的时间状语从句
as soonas意为“一......就......”,强调动作紧密相连。
例如:My family always go somewhere interesting as soon as the holiday begins.
假期一开始,我们全家就会去某个好玩的地方。
We began to work as soon as we got there.我一到那儿就开始工作了。
(3)before/after引导的时间状语从句
before意为“在......之前”,after意为“在......之后"
例如:All things are difficult before they are easy.凡总是先难后易。
Mother sometimes prepares dinner after I come back from school.
妈妈有时在我放学回家后才准备晚饭。
(4)while引导的时间状语从句
while引导的时间状语从句表示主句的行为在从句行为进行的过程中发生。由于while从句表示一个持续的行为,所以从句中要用持续性动词或状态动词,且持续性动词常用进行时态。例如:
While they were crossing the Atlantic, many people died.
多人在横渡大西洋时丧生了。
Don't make any noise while I am recording.我在录音时(你们)别发出声音。
(5)until引导的时间状语从句
until表示动作或状态一直持续到某一时刻,即“直到......为止”。例如:
He waited until all the guests left.他一直等到所有客人都走了。
I will wait until you finish all the work.我会等到你完成所有工作。
(6)since引导的时间状语从句
since引导时间状语从句时,主句常用完成时,意为“自从......”。
例如:I have known Bill since he was born.从Bill出生起,我就认识他。
He has studied very hard since he came to our school.
自从来到我们学校,他学习就非常努力。
时间状语从句5大易错点:
一、易错点1:时态搭配混乱(核心考点:主将从现 / 主过从过)
不理解时间状语从句的时态逻辑——从句表 “将来动作” 时,不用将来时,用一般现在时(主将从现);主句从句均表 “过去动作” 时,时态一致(主过从过)。
错误示例:
When we will visit the industrial area tomorrow, we will wear masks.(×)
As soon as the news reporter arrived at school, the students will cheer.(×)
正确示例:
When we visit the industrial area tomorrow, we will wear masks.(√)
(主将从现:从句用一般现在时表将来,主句用一般将来时)
As soon as the news reporter arrived at school, the students cheered.(√)
(主过从过:主句从句均用一般过去时,时态一致)
—— 常见连词:as soon as(一…… 就)、when(当…… 时)、before(在…… 之前)、after(在…… 之后)。
二、易错点2:when/while/as 的用法混淆
错误本质:不清楚三者的核心区别——动作的持续性 + 时态搭配。
连词 核心用法 时态搭配 错误示例 正确示例
when 可接短暂性 / 持续性动词 主现从现 主过从过 While he knocked at the door, I was doing homework.(×) When he knocked at the door, I was doing homework.(√)
while 只接持续性动词 主句进行时 + 从句一般时 When my mother cooked, I watched TV.(×) While my mother was cooking, I watched TV.(√)
as 强调 “同时进行”,语气较弱 主从时态一致 As we walk, we sing songs.(√)(表同时进行) -
关键口诀:while 接 “持续动作”,常用进行时;when “灵活”,可接短暂 / 持续动作;as“边…… 边……”。
三、易错点3:until(直到)的肯定 / 否定用法混淆
错误本质:不理解“肯定表持续,否定表瞬间” 的逻辑。
正确示例+ 规则:
肯定句(主句为持续性动词):
I will stay here until my father picks me up.(√)
(规则:until 从句用一般现在时表将来,主句用持续动作 “stay”)
否定句(主句为短暂性动词,not until 表 “直到…… 才”):
He didn’t go to bed until he finished his homework.(√)
(规则:否定主句+ until 从句,表 “动作直到从句发生才开始”)
四、易错点4:since(自从)的时态 + 句型错误
错误本质:混淆since 从句和主句的时态,或误用句型。
错误示例:
Since I come to this school, I made many friends.(×)
It’s 3 years since I have left my hometown.(×)
正确示例+ 规则:
规则:since 从句用一般过去时,主句用现在完成时。
Since I came to this school, I have made many friends.(√)
规则:It’s + 一段时间 + since 从句(用一般过去时,且从句动词为短暂性动词时,表 “动作结束多久”)。
It’s 3 years since I left my hometown.(√)(表 “离开家乡 3 年了”)
五、易错点5:时间状语从句中误用 and/so
错误本质:把时间状语从句当作并列句,额外加并列连词(and/so)。
错误示例:
When we finish our homework, and we will go to the park.(×)
After he cleaned the rubbish bin, so the room became clean.(×)
正确示例:
When we finish our homework, we will go to the park.(√)
After he cleaned the rubbish bin, the room became clean.(√)
关键逻辑:
时间状语从句本身已表“时间关系”,无需再用 and(并列)、so(结果),否则句式杂糅。
2.地点状语从句
地点状语从句主要由表示地点的词(如where,wherever和anywhere等)引导。例如:
Please keep sitting where you are.
请一直坐在原处。
He is welcome wherever/anywhere he goes.
无论去哪里,他都受到欢迎。
语法精练
一、单选题。
1. We ______ for you at the gate until you ______ tomorrow.
A. will wait; will arrive B. wait; arrive C. will wait; arrive D. wait; will arrive
答案:C
解析:考查时间状语从句“主将从现”。until 引导时间状语从句,主句表将来用一般将来时(will wait),从句用一般现在时表将来(arrive),排除 A、D;B 选项主句时态不符,故选 C。
2. ______ my brother was playing football, I was reading a novel.
A. When B. While C. As D. After
答案:B
解析:考查when/while/as 区别。从句 “was playing” 是持续性动作,while 后接持续性动词且常用进行时,符合 “while 接持续动作” 的口诀;when 可接短暂 / 持续动作,但此处强调 “同时进行”,while 更贴切,故选 B。
3. It’s three years since he ______ his hometown.
A. left B. has left C. leaves D. will leave
答案:A
解析:考查since 从句时态规则。It’s + 一段时间 + since 从句,从句需用一般过去时(短暂性动词 leave 的过去式 left),表 “动作结束多久”,排除 B(现在完成时)、C(一般现在时)、D(一般将来时),故选 A。
4. He ______ go to bed ______ his mother came back last night.
A. didn’t; until B. not; until C. will; until D. doesn’t; until
答案:A
解析:考查until 否定用法。not until 表 “直到…… 才”,主句用短暂性动词 go to bed;由 last night 可知时态为一般过去时,否定式用 didn’t,排除 B(缺少助动词)、C(将来时)、D(一般现在时),故选 A。
5. ______ we walked along the street, we talked about our school life.
A. When B. While C. As D. Until
答案:C
解析:考查as 的用法。as 强调 “边…… 边……”,表两个动作同时进行(walk 和 talk 同步),语气比 while 弱;when/while 侧重 “当…… 时”,不强调动作同步性,故选 C。
6. Plants grow well ______ there is plenty of sunshine and water.
A. which B. where C. that D. when
答案:B
解析:考查地点状语从句。where 引导地点状语从句,表 “在…… 的地方”,从句修饰主句的地点逻辑(植物生长的地方);which/that 引导定语从句,需有先行词,此处无具体名词作先行词,排除 A、C;when 表时间,不符,故选 B。
7. You can ask for help ______ you are in trouble.
A. wherever B. whenever C. whatever D. however
答案:A
解析:考查地点状语从句连词。wherever 表 “无论哪里”,符合 “无论你在哪里遇到困难都能求助” 的逻辑;whenever 表时间(无论何时),whatever 表事物(无论什么),however 表方式(无论怎样),均不符,故选 A。
8. This is the park ______ we had a picnic last weekend.
A. where B. when C. which D. that
答案:A
解析:考查定语从句vs 地点状语从句。此处 park 是具体先行词,where 引导定语从句(相当于 in which),修饰 park;若为地点状语从句,无先行词,直接表地点逻辑,故选 A。
9. As soon as he ______ the bus, he ______ to the classroom quickly.
A. got off; ran B. gets off; runs C. will get off; will run D. got off; will run
答案:A
解析:考查时间状语从句“主过从过”。由语境可知动作发生在过去,as soon as 引导的从句和主句时态需一致,均用一般过去时(got off/ran);B 选项为一般现在时(表习惯),C、D 时态混杂,故选 A。
10. ______ reading the letter, she cried.
A. When B. While C. As D. After
答案:B
解析:考查状语从句省略规则。从句省略了主语she 和 be 动词 was(完整形式:While she was reading),符合 “主语一致 + 含 be 动词” 的省略条件;when 也可省略,但 while 更常与持续动作(reading)搭配,故选 B。
二、语法填空。
1. I ______ (call) you as soon as I ______ (reach) Beijing tomorrow.
(答案:will call; reach)
解析:考查主将从现。as soon as 引导时间状语从句,主句表将来用 will call,从句用一般现在时 reach 表将来。
2. While my sister ______ (watch) TV, my parents ______ (cook) dinner last night.
(答案:was watching; were cooking)
解析:考查while 的时态搭配。while 接持续性动作,主句和从句均为过去进行时,表 “过去同时进行的两个动作”。
3. He ______ (live) in this city since he ______ (move) here in 2018.
(答案:has lived; moved)
解析:考查since 从句规则。since 从句用一般过去时(moved),主句用现在完成时(has lived),表 “从过去持续到现在的状态”。
4. We won’t leave ______ our teacher ______ (come) back.
(答案:until; comes)
解析:考查not until 的主将从现。until 引导从句,用一般现在时 comes 表将来,主句用一般将来时的否定式 won’t leave。
5. ______ (where) you go, I will follow you.
(答案:Wherever)
解析:考查地点状语从句连词。wherever 表 “无论哪里”,符合 “无论你去哪里,我都跟着你” 的逻辑,句首首字母大写。
6. The little girl always smiles ______ she meets her classmates.
(答案:when/as)
解析:考查时间状语从句连词。when/as 均可表 “当…… 时”,此处表 “遇到同学时微笑”,动作短暂,两者均可。
7. It ______ (be) five years since we ______ (join) the English club.
(答案:is; joined)
解析:考查since 的固定句型。It’s + 一段时间 + since 从句,从句用一般过去时(joined),主句用一般现在时(is)。
8. ______ (walk) along the lake, we saw many ducks swimming.
(答案:While walking/When walking)
解析:考查状语从句省略。从句主语与主句主语we 一致,且含 be 动词(were),省略 we were,用 while/when + 现在分词 walking。
9. Plants can’t grow well ______ there is no water or sunshine.
(答案:where)
解析:考查地点状语从句。where 引导从句,表 “在没有水和阳光的地方”,修饰主句的地点逻辑。
10. After they ______ (finish) their homework, they went to the library.
(答案:finished)
解析:考查主过从过。after 引导时间状语从句,主句 went 为一般过去时,从句也用一般过去时 finished,时态一致。
三、汉译英。
1. 当我到达车站时,火车已经开走了。
答案:When I arrived at the station, the train had already left.
解析:when 引导时间状语从句,从句用一般过去时(arrived),主句用过去完成时(had left),表 “从句动作发生前,主句动作已完成”。
2. 他走到哪里都受到人们的欢迎。
答案:Wherever he goes, he is welcomed by people.
解析:wherever 引导地点状语从句,表 “无论哪里”,主句和从句均用一般现在时,表客观事实;“受到欢迎” 用被动语态 is welcomed。
3. 自从我们上初中以来,我们的校园生活变得更丰富了。
答案:Since we entered junior high school, our school life has become more colorful.
解析:since 引导从句,用一般过去时(entered),主句用现在完成时(has become),表 “从过去持续到现在的变化”。
4. 直到雨停了,我们才出发去公园。
答案:We didn’t set off for the park until the rain stopped.
解析:考查not until 结构,主句用短暂性动词 set off 的否定式(didn’t set off),从句用一般过去时(stopped),表 “雨停后才出发”。
5. 妈妈在做饭的时候,我在打扫房间。
答案:While my mother was cooking, I was cleaning the room.
解析:while 引导从句,接持续性动作 cooking,主句和从句均用过去进行时,表 “过去同时进行的动作”。
6. 在有山有水的地方,空气通常很清新。
答案:Where there are mountains and rivers, the air is usually fresh.
解析:where 引导地点状语从句,从句用 there be 句型(are mountains and rivers),主句用一般现在时,表客观事实。
7. 随着时间的推移,我们越来越明白努力的意义。
答案:As time goes by, we understand the meaning of hard work more and more.
解析:as 引导时间状语从句,表 “随着……”,从句用一般现在时(goes by),主句用一般现在时,表持续的状态。
8. 我将在你需要我的任何时候、任何地方帮助你。
答案:I will help you whenever and wherever you need me.
解析:wherever 引导地点状语从句,whenever 引导时间状语从句,均遵循主将从现,从句用一般现在时(need)。
9. 自从他开始学习钢琴,已经坚持了三年。
答案:It’s three years since he started learning the piano.
解析:考查since 的固定句型,It’s + 一段时间 + since 从句,从句用一般过去时(started),start 后接动名词 learning。
10. 当老师走进教室时,学生们立刻安静了下来。
答案:When the teacher walked into the classroom, the students quieted down at once.
解析:when 引导时间状语从句,接短暂性动作 walked into,主句和从句均用一般过去时(quieted down),时态一致。
谢谢观看
Angel

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