比较状语从句比较状语从句表达人或事物的属性或特征的不同程度主要运用于形容词和副词的原级、比较级及最高级的句子之中 原级：as…as （和 一样），not so （as）…as •••（和不一样）;比较级：more…than （更）；最高级：The most …in/of, the + 形容词 +est …of/in一．原级比较1. as+原级+as （第一个as是副词，含 如此”的意思，在主句说明所比内容的程度；第二个 as是连词，含 “比”或“如此 ”的意思,引导从句） 例如：Our classroom is as big as theirs. 我们的课室跟他们的一样大I hope you like it as much as I do. 我喜欢你跟我一样喜欢它在这种结构中，比较成分的前面常用表示倍数的词如 -times （ ••倍）,twice （两倍）等来表示相比较的两个成分相差的倍数，通常译作 像••几倍那样多” 是••的几倍”例如：The speed of sounds in water is about four times as great as in air声音在水中的速度是空气中的 4倍左右。
This book is twice as thin as that one. 这本书的厚度是那本书的二分之一2. not so / as -as-（不像••那样，不如）第一个as/so是副词，在主句中作状语，修饰其后的形容词 /副词；第二个as是连词，引导从句not so…as比not as…a用得比较普遍例如：It is not as easy as you think. 事情并不像你想的那么容易The work did not go so smoothly as we hoped. 这工作并不像我们希望的那样顺利二．比较级1. 形容词/畐恫的比较级+than+被比较的对象表示两个人或事物在某（些）方面的差别 than是连词，引导从句后面被比较对象如果是名词,多用省略形式,省去与主句中相同的部分Man grows fast er than the planet he inhabits. 人类成长的速度远比他居住的星球快得多注意：①从句中的主语（名词）如果与主句中的主语一致，为了避免重复，常用 that代替不可数或某可数名词,用 those 代替可数复数名词,用 one 或 ones 代替可数名词。
例如：The result of this experiment is better than that of the last one.这次实验的结果要比上次好The students in our class are more diligent than those in their class. 我们班的学生比他们班的学生用功②比较状语从句的动词，如果与主句的谓语动词一致，且为行为动词时，常用 do （does, did）代替，以免重复例如：We have produced even more coal this year than we did that year. 我们今年出产煤要比去年出产得更多She drives better than her husband does. 她开车开得比她丈夫好2. ①"no比较级+than "（不比••多，不少于）no是副词，在主句中作状语，修饰形容词或副词的比较级； than 是连词,引导从句 例如：Tom is no less diligent than peter. 汤姆用功不比彼得差汤姆和彼得同样用功）He feels no better today than he did yesterday.他今天的感觉不比昨天好 /他今天的感觉跟昨天同样不好。
②“ not more than ”不如 …（前者不如后者 ）Jack is not more dilige nt than Joh n. 杰克不如约翰勤奋3. 句型the -the •（越••越…）即：从句：the +比较级 …，主句：the +比较级 …The more we study, the more we discover our ignorance. 我们越学习，就越发现自己无知主句如果是将来时，从句可用现在时代替将来时例如：The Ion ger the treatme nt is delayed, the worse the progno sis will be. 延误治疗的时间越长，预后越差三.最高级1. The most …in/ofThis book is the most in teresti ng of the three. 这本书是三本中最有趣的2. the + 形容词 +est …of/inThis road is the busiest street in our city. 这条路是我们城市最繁忙的街道3. one of the + 名词(复数)…之一(用于最高级)Tom is one of the best students in our school. Tom 是我们学校最好的学生之一。
一.填空：1. He looks a brick wall. (n ervous)2. Drive you can. (safe)3. His new boss is much his last. (in teresti ng)4. The car is running less it used to. (smoothly)5. You are person I ' ve met. (annoying)6. we ll drive a bit you do, so we ' ll get there first. (fast)7. I like Jack and Tom, but I think Jack is of the two. (nice)8. You' re far I am. (tolerant)9. Is your mother any ? (relaxed)10.She' sof the Smith girls. (se nsible)11.Could you comeyou usually do.12.Honey is just aboutsugar. (sweet)13.Doesn' t Alice look a bithe did last week? (un happy)14.What isjoke you have ever heard? (funny)15.We boughtboards we could find. (thick)．翻译：1. 天气不如去年冬天那么冷。
2. 他行动起来比他妹妹慢3. 他是班里最高的学生4. 他跟他哥哥一样刻苦工作5. 她是姐妹中最漂亮的一个二．短文填空Dear Jim,We' ve moved into the old house at last! The repairs took longer and were more expensive we hadexpected, but living in the old house is just much fun we had hoped it would be!The cleaning wasn ' t quite bad we were anticipa预料(),but of course, more we cleaned, less we enjoyed it! But we knew that the sooner we started, we ' d have it all finished.The actual removal went quit smoothly. Fortunately, the removal men weren ' t careless we hadfeared, so we had fewer breakages expected. The grandfather clock stood up to it all very well!How are things with you and the family? Is life in New York still busy ever?Sorry I haven ' t written earlier, but as we say, “Better late never! ”PeterKey:一、 1. as . as 2. as . as 3.more . than 4. . than 5.the most . 6. faster than 7. the nicer 8.more . than9.more . 10. the most . 11. more earlier than 12. as . as 13. . than 14. the funniest 15. the thickest二、 1. The weather is not so cold as it was last winter.2. He moves more slowly than his sister does.3. He is the tallest student in the class.4． He works as hard as his elder brother.5. She is the most beautiful among her sisters.thanthan as as so as the the the sooner as as than as as。