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1、英语语法解析 聚焦高考题，透视as考点,as引导非限制性定语从句时，指代逗号前的整个句子（即先行 词），常翻译为“正如，正像”，可置于句首或句末。（注： which只能放在句中）。 eg. _is reported in the newspaper, talks between the two countries are making progress. (北京卷) A. It B. As C. That D. What 解析： B。 as it reported意思是“正如所报道的”。What 只能引 导名词性从句。That 只能引导非限制性定语从句。如果用It,句 子应该是：It is r
2、eported in the newspaper that talks between the two countries are making progress.,一. as做关系代词，引导非限制性定语从句,as引导非限定性关系从句, 对前述内容作补充，意为“正如， 本情况, 该事实“等，位置主句前后均可。 eg. 1.She has married again, as was expected. 她已再婚,这是意料中的事。 2.As anyone can see, We are tired. 我们累了,这是有目共睹的。,as引导非限制性定语从句 小结,在as做关系代词，引导限制性定语从句这
3、一用法中，关系代词 常出现在the same as, such as, soas, asas, 等结构中。 eg. His plan was such a good one _ we all agreed to accept it. (陕西卷) A. as B. that C. so D. and 解析： B。尽管句中有such,但从句中accept后面有宾语,所以这 是suchthat引导的结果状语从句，意为“如此以至于”。 用as需要把句子改写成：His plan was such a good one as we all agreed to accept “as”引导定语从句在从句中充当
4、成分。,二.as做关系代词，引导限制性定语从句,as与such, the same, as等连用, 引导限定性关系从句,意为“与相同的事物(或人)”，修饰先行词，而且在从句中要充当成分。 1.It is such an easy book as he can read. 这是一本他能读的容易懂的书。 2.I received the same grade as you did. 我跟你得到同样的分数。,as引导限制性定语从句 小结,as 引导让步状语从句，意为“尽管”。句子必须用倒装结构。 eg. _ ，he talks a lot about his favorite singers aft
5、er class. (重庆卷) A. Quiet a student as he may be B. Quiet student as he may be C. Be a quiet student as he may be D. Quiet as he may be a student 解析： B .若表语是单数名词,则该名词不用冠词修饰。,三. as 引导让步状语从句,as引导倒装结构,表示让步关系,其结构为： “as+主语+谓语+” 使用此结构时应注意以下几点:1)倒装的部分一般为表语、状语和 动词原形。2)表语是单数可数名词,其前面的a (an)要省去; 3)倒装 的动词原形常与may
6、, might, will, would等词连用,但这些词都要保 留在原来位置上。 1.Child as he is, he speaks English well. 他虽是个孩子,但英语说得很好。 2.Much as I like the book, but I have no money to buy it. 虽然我非常喜欢这本书,但我却没钱买。 3.Try as he might, Tom could not find a job. 不管怎样努力,汤姆还是找不到一份工作。,as 引导让步状语从句 小结,as 引导比较状语从句时（asas/not asas/not soas）。 eg. J
7、ohn is the tallest boy in the class, _according to himself. (安徽卷) A. five foot eight as tall as B. as tall as five foot eight C. as five foot eight as D. as tall five foot eight as 解析：A。用as+形容词+as+基数词+单位。表示“高达-”，再 如：This man is as tall as eight feet.,四.as 引导比较状语从句,“as + 形容词或副词原级 + as” 意为“和一样”，表示同级 的
8、比较，但要注意第一个as为副词，第二个as为连词。根据比较 对象和性质的不同又可以把此种结构分为三种： 一.“asas结构”用于表示不同人或物同一性质的比较，意为“和一样”。 eg. The tree is as tall as the building (is) 这棵树和那栋楼一样高。 二.“asas结构”用于表示同一个人或物不同性质的比较，意为 “既又” 。 eg. This swimming pool is as wide as it is long. 这个游泳池宽度和长度相等,as 引导比较状语从句 小结,三. “as + 形容词或副词原级 + as”结构的变体形式是“as + 形容词
9、+ a +单数名词+ as 或 as + many / much +名词+ as”。 意为“和一样”。 1. I dont want as expensive a car as this. 我不要这么贵的汽车。 I dont want a car as expensive as this 2. This is as good an example as the other is. 这个例子和另外一个例子一样好。,as 引导比较状语从句 小结,as引导时间状语从句，表示“当时候”或者“随着”。 eg. _ the day went on, the weather got worse. (全国卷)
10、 A.With B. Since C.While D.As 答案 D. as 意思为“随着”。 With不可以引导从句。,五.as引导时间状语从句,as引导时间状语从句，意为“当时；同时，随着”。作“当时”解,引导时间状语从句，表示主句动作与从句动作同时发生。 eg. 1.As she left the room she remembered that book. 她离开房间时想起了那本书。 2.As the sun rose，the fog dispersed. 太阳一出来, 雾随之消失。,as引导时间状语从句 小结,as 引导方式状语从句。 eg.Who should be respons
11、ible for the accident? The boss, not the workers. They just carried out the order _. (福建卷) A. as told B. as are told C. as telling D. as they told 解析：A。as引导方式状语从句，表按照、正如；as told “从属连词 + -ed /-ing 形式” 可以看作是一种省略，即省略了主语和be动词。究竟使用何种非谓语动词形式取决于主被动关系。,六.as 引导方式状语从句,as引导方式状语从句，意为“按照”、“依照”、“像” 。 1.Doctors ha
12、ve said that as many as 40 percent of patients dont take medicine as directed. 医生说多达40%的病人没有按照被指导的方式吃药。 2. As I explained on the phone, your request will be considered at the next meeting. 按照我在电话里解释的，你的要求在下次会议上考虑。,as 引导方式状语从句 小结,as引导原因状语从句。 eg. Jenny was very sad over the loss of the photos she had
13、shot at Canada, _ this was a memory she especially treasured. (广东卷) A. as B. if C. when D. where 解析：A。as 作从属连词引导原因状语从句。,七.as引导原因状语从句,as和because, since, for的区别是： 1.because语势最强，用来说明人所未知的原因，回答why提出 的问题，可置于强调句中且其前可加修饰语。 2.since是双方都知晓原因或经过分析而得之的原因，语气次之。 3.for是并列连词，前用逗号隔开，表逻辑推理或补充说明。 4.as语气最弱，原因是显而易见的或已为人
14、们所知，即已知原 因，所引导的分句可置于句首。 eg. We had better hurry as it is getting dark. 天变暗了，我们最好快点。,as引导原因状语从句 小结,eg. With the help of the German experts, the factory produced _ cars in 1993 as the year before. A. as twice many B. as many as twice C. as twice as many D. twice as many 解析：如果表示一方是另一方的若干倍时,“倍数+as+原级形 容
15、词/副词+as ”为一常用结构。,八. as构成的倍数表达法,twice as many,表示倍数的句型： A +is +倍数+ as + 形容词原级 + as； A +is +倍数 + the + size (height, length, width) eg. 这个广场是那个的两倍大。 This square is twice as large as that one. = This square is twice the size of that one.,as构成的倍数表达法 小结,twice as many,eg. Lets learn to use the problem we are facing _ a stepping-stone to future success. (全国卷) A. to B. for C. as D. by 解析: C。as作介词表“作为”，常接在 treat / regard / use / recogn
