副词的比较级和最高级.

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1 副词的比较级和最高级

2 副词的比较级 大多数副词有比较级和最高级的变化，即原级、比较级和最高级，用来表示事物的等级差别。原级即形容词的原形，比较级和最高级有规则变化和不规则变化两种。 1) 规则变化单音节词和少数双音节词，加词尾-er，-est来构成比较级和最高级。

3 构成法　　　　原级　　　　比较级　　最高级　　　一般单音节词　　tall(高的)　　 taller　　tallest 未尾加-er,-est　great(巨大的)　greater　greatest 以不发音的e结尾　nice(好的)　　 nicer　　nicest 的单音词和少数　 large(大的)　　larger　 largest 以- le结尾的双　able（有能力的) abler　　ablest 音节词只加-r,-st　　　　　　　　　　　　　　　　 以一个辅音字母　big(大的)　　　 bigger　 biggest 结尾的闭音节单　hot热的)　　　　hotter　 hottest 音节词，双写结 尾的辅音字母， 再加-er，-est　　　　　　　　　　　　　　　　　　

4 "以辅音字母+y"　easy(容易的)　　easier　 easiest 结尾的双音节词，busy(忙的)　　　busier　 busiest 改y为i，再加 -er，-est　　　　　　　　　　　　　　　　　　　　少数以-er，-ow　clever(聪明的)　cleverer cleverest 结尾的双音节词　narrow(窄的)　　narrower narrowest 未尾加-er，-est　　　　　　　　　　　　　　　　　 其他双音节词和　important(重要的)　 多音节词，在前　　　　　　more important 面加more，most　　　　　　most important 来构成比较级和　easily(容易地) 最高级。 more easily　　most easily

5 2) 不规则变化 原级 比较级 最高级 good(好的)/ better best well(健康的) bad (坏的)/ worse worst ill(有病的) old (老的) older/elder oldest/eldest much/many(多的) more most little(少的) less least far (远的) farther/further farthest/furthest

6 as + 形容词或副词原级 + as 1）在否定句或疑问句中可用so… as。 He cannot run so/as fast as you. 2）用表示倍数的词或其他程度副词做修饰语时，放在as的前面。 This room is twice as big as that one. Your room is the same size as mine.

7 3）倍数+ as + adj. + as　<=> 倍数+ then + of This bridge is three times as long as that one. This bridge is three times the length of that one. Your room is twice as large as mine. Your room is twice the size of mine.

8 比较级副词 + than You are taller than I
比较级副词 + than You are taller than I. They lights in your room are as bright as those in mine. 注意： 1）要避免重复使用比较级。 (错) He is more cleverer than his brother. (对) He is more clever than his brother. (对) He is clever than his brother.

9 2）要避免将主语含在比较对象中。 (错) China is larger that any country in Asia. (对) China is larger than any other countries in Asia

10 3）要注意对应句型，遵循前后一致的原则。 The population of Shanghai is larger than that of Beijing. It is easier to make a plan than to carry it out.

11 4）要注意冠词的使用，后有名词的时候，前面才有可能有名词。 比较：Which is large, Canada or Australia
4）要注意冠词的使用，后有名词的时候，前面才有可能有名词。 比较：Which is large, Canada or Australia? Which is the larger country, Canada or Australia? 　　She is taller than her two sisters. 　　She is the taller of the two sisters.

12 the + 最高级 + 比较范围  The Sahara is the biggest desert in the world. 形容词最高级前通常必须用定冠词 the，副词最高级前可不用。形容词most前面没有the，不表示最高级的含义，只表示“非常”。 It is a most important problem. =It is a very important problem.

13 注意： 使用最高级要注意将主语包括在比较范围内。
(错)Tom is the tallest of his three brothers. (对)　Tom is the tallest of the three brothers 下列词可修饰最高级： by far, far, much, mostly,almost..This hat is nearly / almost the biggest.

14 注意： very可修饰最高级，但位置与much不同。 This is the very best.This is much the best. 序数词通常只修饰最高级。 Africa is the second largest continent. 3) 句型转换： Mike is the most intelligent in his class. Mike is more intelligent than any other students in his class.

15 4) “否定词语+比较级”，“否定词语+ so… as”结构表示最高级含义。
如： Nothing is so easy as this. =Nothing is easier than this. =This is the easiest thing.

16 和more有关的词组  the more… the more…　越……就越…… The harder you work，the greater progress you will make. 2) more B than A　与其说A不如说B less A than B He is more lazy than slow at his work. = He is less slow than lazy at his work.

17 The officials could see no more than the Emperor.
no less… than…　与……一样…… He is no less diligent than you. 4) more than　不只是，非常 She is more than kind to us all

18 典型例题: The weather in China is different from____. A. in America B
典型例题: The weather in China is different from____.A. in America B. one in America C. America D. that in America 答案：D. 本题意为"中国的天气比美国热。"比较的是天气而不是国家，C不能选。A没有名词，后句成分不全，排除。B和D中，B中的one常用来代替可数名词，而that可车以代替不可数或抽象名词，所以选D。

19 Thank you. Get relaxed!