一、形容词、副词的比较级和最高级的构成规则
1．一般单音节词，比较级在后面加-er，最高级在后面加-est
如：small→→ short→→
2．以不发音e结尾的单音节词，比较在原级后加-r，最高级在原级后加-st
如：large→→ nice→→
3．在重读闭音节中，先双写末尾的辅音字母，比较级加-er，最高级加-est
如：big→→fat→→
4．以“辅音字母＋y”结尾的双音节词，把y改为i，比较级加-er，最高级加-est 如：easy→→happy→→
5．双音节词和多音节词，比较级在前面加more，最高级在前面加most
如：beautiful→→
easily→→
6．不规则变化
如：good / well→→bad / ill →→ old→/ →/
many/much→→ little→→
far →/ → /
二、形容词、副词的比较级的用法
1. “as + 原级+ as”
Tom和Mike一样高。
Tom is as tall as Mike.
2. “not as(so) +原级+ as”或“less + 原级+ than”
我做作业不如你细心。
I did not do my homework as carefully as you.
I did my homework less carefully than you.
3.“比较级+than”
今天比昨天暖和。
(得多)
Today is much warmer than yesterday.
2．“比较级+ and + 比较级”或“more and more +原级”
如：风变得越来越大。
The wind is getting more and more heavily.
4. “the +比较级……, the+比较级”
如：赚的越多，花的越多。
The more money you make, the more you spend.
5. “more... than”
与其说她聪明，不如说她漂亮。
She is more beautiful than smart.
6. “more than” + 数字
八百多人出席了这场音乐会。
More than 800 people attended this concert.
7. “less than”不到.....，不太...
去车站不到一英里。
It is less than 1 mile to the station.
8. “no less than”多达，不少于
他至少赢了600万英镑。
He won no less than 600 pounds.
5. 表示倍数的比较级用法：
a) 倍数+as+形容词/副词原级+ as
b) 倍数+形容词/副词比较级+than
c) 倍数+ the + n. + of
这条绳子的长度是那条的4倍。
a) The rope is four times as long as that one.
b) The rope is three times longer than that one.（长3倍，即是它的4倍。
比如绳子A 长1米，绳子B 4米，那么B是A的4倍，B比A长3倍）
c) The rope is four times the length of that one.
三、形容词、副词的最高级的用法
形容词、副词的最高级形式表示“最……”的意思。
句子中有表示范围的词或短语。
如：of the three, in our class等等。
如：他是我们班最胖的。
He is the fattest in our class.
Tom is the tallest of his three brothers.
错。
Of his three brothers 不包括Tom，无法比较。
也就是说T om没有在可比较的范围。
Tom is the tallest of the three brothers.
对。
He is more cleverer than his brother.
错。
More 和-er重复。
下面两个都对。
Clever变比较级比较特殊。
He is more clever than his brother.
He is cleverer than his brother.
China is larger than any country in Asia.
错。
Any country in Asia 包括中国，所以不能说“中国比亚洲的任何国家、包括中国要大。
”China is larger than any other country in Asia.
对。
Any other country任何其他的国家，把中国排除在外。
The population of Shanghai is larger than Beijing.
错。
同类才能比较。
前面是上海的人口，后面是北京这个城市。
应该改为“The population of Shanghai is larger than that of Beijing.”that指the population，避免重复。