知识点—as引导状语从句课件.ppt

1、知识点 as引导状语从句as引导状语从句【一、引导状语从句用法一、引导状语从句用法】作为连词，as极其活跃，能引导多种状语从句，本文拟将这一用法作一归纳。1、引导时间状语从句As you study a globe,you may notice that most of the large land areas are connected,or almost so.(高一册，第267页)As the steam expands,the temperature falls.当水蒸汽膨胀时，温度就下降。Just as I was backing out,my sleeve caught on th

2、e corner of a tray of diamonds.(高三册，第225页)as引导状语从句【一、引导状语从句用法一、引导状语从句用法】2、引导原因状语从句As Li Ping was not well,I went there myself.(高一册,第96页)As water is a good solvent,pure water is never met with in nature.因为水是一种很好的溶剂，所以在自然界从未遇见过纯水。as引导的原因状语从句也可以采用倒装结构，如：Tired as he was,he want to bed at once.他因为很累，所以马上

3、就去睡了。Michael,fool as he was,completely ruined the dinner.由于迈克尔的愚蠢，这次宴会全给搅乱了。as引导状语从句【一、引导状语从句用法一、引导状语从句用法】Absorbed as he was in a mathematical problem,he did not notice my entering the room.由于他全神贯注在解一道数学题，所以没有注意到我走进房间。But,living as it does in a community of cells,it is not independent at all.(高二册，第3

4、36页)Living as we do in a remote village,we have few visitors.由于我们住在一个偏僻的村子里，所以没有什么来客。as引导状语从句【一、引导状语从句用法一、引导状语从句用法】3、引导让步状语从句，其结构如下：1）adj.+as+主语系动词beYoung as he is,he knows a lot of things.他年龄不大，可知道的事情却不少。Poor as he was,he was honest.他虽然穷，但很诚实。Hard as steel is,it will bend or break under the action

5、of a strong force.钢虽然很硬，但在强力作用下也会弯曲或断裂。as引导状语从句【一、引导状语从句用法一、引导状语从句用法】2）n.+as+主语系动词be，Child as he is,he knows a lot of things.他虽然是个孩子，可知道的事情却不少。King as he is,he is unhappy.他虽然是国王，但还是不开心。Expert as he was,he failed.他虽然是专家,但还是失败了。注意在本句型中，句首的单数可数名词前不用冠词。试比较下面这个与第一句意义相同的句子：Although he is a child,he knows

6、a lot of things.as引导状语从句【一、引导状语从句用法一、引导状语从句用法】3）adv.+as+主语+动词，Much as I like it,I wont buy it.尽管我很喜欢它，但我却不买。Fast as you read,you cant finish the book in two days.尽管你读得很快，你也不能在两天之内读完这本书。4）v.(原型)as主语助动词，Try as you may,you will never succeed.你尽管可以试，但决不会成功。as引导状语从句【一、引导状语从句用法一、引导状语从句用法】4、引导方式状语从句The abs

7、ence of air also explains why the stars do not seem to twinkle in space,as they do from the earth.(高二册，第198页)太空中没有空气，这也说明了为什么在太空星星看来并不闪烁，不像从地球上看到的那样。Solids expand and contract as liquids and gases do.固体像液体和气体一样也会膨胀和收缩。as引导状语从句【一、引导状语从句用法一、引导状语从句用法】as在引导方式状语时，前面可以有加强语气的just：Just as sound is a wave mo

8、tion,light in the same sense,may be regarded as a wave motion.正如声音是一种波动一样，光也同样可以看作是一种波动。I knew his wife must be praying for him,just as I was praying for James.我知道他妻子一定在为他祈祷，正如我为詹姆斯祈祷一样。Electricity flows through a wire just as water flows through a pipe.电通过导线,就像水流过管子一样。as引导状语从句【一、引导状语从句用法一、引导状语从句用法】

9、5、比较状语从句They produce gases almost as harmful as the gases from factories.(高一册，第194页)You know as much about that as I do.as引导状语从句【二、二、as,while,when引导时间状语从句的区别引导时间状语从句的区别】as引导的时间状语从句,可以表达“正当”，“一边一边”，“随着”等意思1.表示某事一发生，另一事立即发生。As the sun rose,the fog disappeared.2.表示在某事发生的过程中，另一事发生。Just as he was speakin

10、g there was a loud.as引导状语从句【二、二、as,while,when引导时间状语从句的区别引导时间状语从句的区别】3.表示两个动作同时发生。Helen sang a song as she washed.4.表示“随着.”，常指一个行为是另一个行为的结果。5.As she grew older,she became more beautiful.as引导状语从句【二、二、as,while,when引导时间状语从句的区别引导时间状语从句的区别】while:持续性动词进行时1.一般或现在情况I like listening to music while I am doing

11、homework.2.将来情况,一般现在时或现在进行时3.过去情况I hurt my shoulder while I was doing gym.as引导状语从句【二、二、as,while,when引导时间状语从句的区别引导时间状语从句的区别】4.while表示转折“尽管”的意思When:当的时候When I was young,I went to town myself.When he receives the letter,hell tell us.hardly.when.“一.就.”as引导状语从句【三、练习题三、练习题】1.Its much easier to make friend

12、s _ you have similar interests.A.unless B.when C.even though D.so that2.Hot _the night air was,we slept deeply because we were so tired after the long journey.A.although B.as C.while D.however3.I had hardly got to the office _ my wife phoned me to go back home at once.A.when B.than C.until D.afteras

13、引导状语从句【三、练习题三、练习题】4._volleyball is her main focus,shes also great at basketball.A.Since B.Once C.Unless D.While5.One Friday,we were packing to leave for a weekend away _ my daughter heard cries for help.A.after B.while C.since D.whenas引导状语从句【三、练习题三、练习题】Keys:1.B 2.B 3.A 4.D 5.D 解析：1.本题考查状语从句的连词。本题可以把

14、四个选项分别放到空处，其中只有选项B能使语意通顺，为正确答案；其他三个选项的意思分别是“除非”，“即使”，“以便”，都不合乎句意，排除。【句意】当你们有相似的爱好的时候，交朋友就容易的多。考查状语从句。hot是做从句的表语，提前说明从句时倒装，即as引导的让步状语从句中，要将从句中的表语，状语，或动词原形提到as之前，故选B。as引导状语从句【三、练习题三、练习题】3.此题较易。只要辨认出固定句型hardly.when.问题即刻解决。句意：我刚到办公室，我妻子就给我打电话让我立刻回家。4.句意为：虽然排球是她的主要项目，但她还擅长篮球。while“虽然，尽管”，引导让步状语从句。since“自从”，once“一旦”，unless“除非”，均不合题意。5.语义表示我们正在收拾行李，这时我的女儿听到求救的呼喊。be doing when表示“正在做某事，这时(突然)”是常见结构，故选D项。