知识点—as引导状语从句

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】,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

2、 the 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】,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

3、累，所以马上就去睡了。 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】,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

4、. (高二册，第336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】,3、引导让步状语从句，其结构如下： 1）adj.+as+主语系动词be Young 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 unde

5、r the action 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】,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

6、 child, he knows a lot of things.,as引导状语从句,【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】,4、引导方

7、式状语从句 The absence 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】,as在引导方式状语时，前面可以有加强语气的just： Just as sound i

8、s a wave motion, 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、

9、引导状语从句用法】,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、as, while , when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

10、 was speaking there was a loud.,as引导状语从句,【二、as, while , when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、as, while , when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 do

11、ing 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、as, while , when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】,1.Its much easier to

12、 make friends _ you have similar interests. A. unless B. when C. even though D. so that 2. Hot _the night air was, we slept deeply because we were so tired after the long journey. A. although B. as C. while D. however 3. I had hardly got to the office _ my wife phoned me to go back home at once. A.

13、when B. than C. until D. after,as引导状语从句,【三、练习题】,4._volleyball is her main focus, shes also great at basketball. A. Since B. Once C. Unless D. While 5. One Friday, we were packing to leave for a weekend away _ my daughter heard cries for help. A. after B. while C. since D. when,as引导状语从句,【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】,3.此题较易。只要辨