请看试题：
I know you are shorter than your brothers, but you run _____ .
A. more faster B. fastest
C. faster D. fast
【易错选项】选C
【易错原因】只注意到than，忽视 your brothers为复数。平时没有对暗含的形容词、副词比较等级的用法的思考和积累是做错的根本原因。
【正确答案】B
【试题解析】由题干中的 your brothers可知，比较的范围是三者以上，故用fast的最高级形式fastest修饰run。
英文中的形容词和副词一般都有三种级的形式即：原级（The Positive Degree），比较级（The Comparative Degree）和最高级（The Superlative Degree）。
1) 同级比较往往由"as 形容词/ 副词的原形 as"的句式表达;当然也要注意它的否定形式、以及在第一个as前加倍数或程度副词的情况。
2)"比较级 than"引导不同级的比较。"比较级" 前同样可以加倍数或程度副词。另外"no more …than"意思是"A和B一样不……" 。具体这个词组的用法分析小编将在今日头条近期文章专门论述。
3) 形容词的最高级前一般必须有定冠词the;但是也有不加定冠词the的几种情况。
一、 同级比较中有两种情况：
A 表示双方情况"一模一样"，用as 原级 as的结构;
B 表示双方情况"不(那么)一样"，用not so / as 原级 as的结构。在这两种结构中，第一个as是副词，而第二个as是连词;在第二个as的后面接名词、句子或代词的主格(一般不要接代词的宾格)。例如：
My parcel is as heavy as yours . 我的包裹与他的一样沉。
His bedroom is not as neat as his sister's. 他的卧室没有他姐姐的整洁。
It is not so hot as yesterday. 今天不象昨天那么热。
* 在as … as 的结构中，我们还常见这样两种句型：as much 不可数名词 as 和as many 复数可数名词 as 。例如：
I hate Lewis and his kind just as much as you do
我和你一样痛恨刘易斯之流。
《柯林斯高阶英汉双解学习词典》
I enjoy pleasure as much as the next person
我和别人一样愉快。
《柯林斯高阶英汉双解学习词典》
I've got as much respect for the cloth as the next man.
我和任何人一样都对神父充满敬意。
《柯林斯高阶英汉双解学习词典》
Malone, a cop, felt as much an outsider as any of them.
马隆是个警察，他跟他们一样都觉得自己像个外人。
《柯林斯高阶英汉双解学习词典》
The goal is to raise as much money as possible.
目的是筹集到尽可能多的资金。
《柯林斯高阶英汉双解学习词典》
Have as much fun as possible at college, but don't let it take precedence over work
在大学要尽情娱乐，但不要把它看得比学习还重要。
《柯林斯高阶英汉双解学习词典》
Their aim will be to produce as much milk as possible
他们的目标是尽可能提高牛奶产量。
《柯林斯高阶英汉双解学习词典》
He has learned as many English words as his brother (has ) . 他已学了和他哥哥一样多的英文单字。
The machines start to wear down, they don't make as many
nuts and bolts as they used to
机器开始出现磨损，螺母和螺钉的产量不如从前了。
《柯林斯高阶英汉双解学习词典》
Rachel already knows as many words in German as she does in English
雷切尔掌握的德语词汇已经和她掌握的英语词汇一样多了。
《柯林斯高阶英汉双解学习词典》
The first thing is to support as many shows as one can,
not forgetting the small local ones.
首先要尽可能多地支持演出，这其中也包括当地的小型演出。
《柯林斯高阶英汉双解学习词典》
We produced ten times as many tractors as the United States.
我们生产的拖拉机的数量是美国的10倍。
《柯林斯高阶英汉双解学习词典》
I've always entered as many photo competitions as I can
我总是尽可能多地参加摄影比赛。
《柯林斯高阶英汉双解学习词典》
She gets as many as eight thousand letters a month.
她一个月里收到的信件多达8,000封。
《柯林斯高阶英汉双解学习词典》
He polled four times as many votes as his rival.
他得到的选票数量是竞选对手的4倍。
《柯林斯高阶英汉双解学习词典》
Durham had garnered three times as many votes as Carey
德拉姆获得的选票是凯里的3倍。
《柯林斯高阶英汉双解学习词典》
二、形容词比较级的用法：
形容词的比较级用于两个人或事物的比较,其结构形式如下:
主语 谓语(系动词) 形容词比较级 than 对比成分。 也就是, 含有形容词比较级的主句 than 从句。注意从句常常省去意义上和主句相同的部分, 而只剩下对比的成分。
Our teacher is taller than we are. 我们老师的个子比我们的高。
It is warmer today than it was yesterday. 今天的天气比昨天暖和。
This picture is more beautyful than that one. 这张照片比那张照片漂亮。
The sun is much larger than the moon. 太阳比月亮大得多。
三、形容词最高级的用法：
形容词最高级用于两个以上的人和物进行比较, 其结构形式为:
主语 谓语(系动词) the 形容词最高级 名词 表示范围的短语或从句。
She is the best student in her class. 她是班上最好的学生。
Shanghai is one of the largest cities in China. 上海是中国最大城市之一。
注意以下几点：
一、不能使用双重比较等级
即构成比较级时不能既加词尾-er，又在其前加more；构成最高级时不能既在词尾加-est，又在其前加most，如不能说more better, most earliest 等。不过“比较级 and 比较级”这样的形式却完全可用。如：
I am getting fatter and fatter. 我越来越胖了。
We’re going more and more slowly. 我们越走越慢了。
二、使用比较等级要注意合乎逻辑
请看两组正误句：
我的电脑比她的贵。
误：My computer is more expensive than her
正：My computer is more expensive than hers.
析：从逻辑上说，应该是my computer 与 her computer 作比较，而不是my computer 与her 比较。上面正句中的hers=her computer。
上海人口比中国其他城市的人口要多。
误：The population of Shanghai is larger than that of any city in China.
正：The population of Shanghai is larger than that of any other city in China.
析：从逻辑上说，Shanghai在China范围内，或者说Shanghai也是China范围内的一个城市，若不用other，则句意为“上海的人口比中国任何城市的人口都多”，
三、注意比较级和最高级的常见修饰语
(1) 比较级的修饰语：常见的有far, even, still, a lot, lots, a great deal, a bit, rather, three times, any, no, very much 等。如：
Japanese is much [far] more difficult than English. 日语比英语难多了。
She felt a great deal more comfortable now. 她现在感觉舒服多了。
He works hard, but she works still harder [harder still]. 他工作很努力，但她工作更努力。
(2) 最高级的修饰语：常见的有(by) far, much, nearly, almost, not quite, by no means, very, second, next 等。如：
His illness is far more serious than we thought. 他的病比我们想像的要严重得多。
China’s population is by far the largest of any country. 中国是全世界人口最多的国家。
I want to give my children the very best education I can afford. 我想给我孩子力所能及的最良好的教育。
The Yellow River is the second longest river in China. 黄河是中国第二长河流。
注：very不能修饰比较级，却可修饰最高级，但它与一般的修饰最高的副词有所不同，即它要放在最高级前定冠词之后，而不是之前(另外，second, third, next等也要入在定冠词之后)。
四、more …than 与 less…than 的用法比较
从本义上看，前者表示“比……多(更)”，后者表示“比……少”或“不如……”。
He has more money than me. 他的钱比我多。
He is said to pay less income tax than he should. 据说他所得税交得不够。
另外，两者均可用于引申义，表示“与其……不如……”，但两个比较的对象的位置不一样。如：
He is less a teacher than an expert.= He is more an expert than a teacher. 与其说他是老师，不如说他是专家。
