比较级（Comparative Degree） 是英语中用于比较两个事物或人的语法形式，通常通过形容词或副词的变形或添加修饰词来实现。以下是详细的解释和示例：

一、比较级的构成

1. 单音节词和部分双音节词
      在词尾加 -er，并搭配 than 使用。
      规则变形：
   例子：
   

• This box is heavier than that one.

• She runs faster than me.

• 直接加 -er：small → smaller

• 以 e 结尾的词加 -r：large → larger

• 以“辅音+y”结尾的词，变 y 为 i 再加 -er：happy → happier

• 以“短元音+单辅音”结尾的词，双写辅音加 -er：big → bigger

2. 多音节词和部分双音节词
      在形容词或副词前加 more，并搭配 than。
   例子：
   

• This book is more interesting than the movie.

• He speaks more clearly than his brother.

• 规则：important → more important

• 例外：某些双音节词可用两种形式（如 clever → cleverer 或 more clever）。

3. 不规则变形
      部分形容词/副词有独特的变化形式：
   例子：
   

• Her grades are better than last year.

• The weather today is worse than yesterday.

• good/well → better

• bad/badly → worse

• far → farther（距离）/ further（抽象意义）

• little → less

二、比较级的用法

1. 直接比较两个事物
      结构：A + 动词 + 比较级 + than + B
   

• My phone is cheaper than yours.

• He works harder than his colleagues.

2. 隐含比较（不出现 than）
      通过上下文暗示比较对象：
   

• Which dress do you like? — I prefer the redder one.

• Let’s take a shorter route.

3. 渐进式比较
      用 “比较级 + and + 比较级” 表示逐渐变化：
   

• The noise became louder and louder.

• She is getting more and more confident.

三、特殊规则与注意事项

1. 避免重复比较
      错误：more happier→ 正确：happier
      错误：more better→ 正确：better

2. 比较对象要对等
      错误：The weather here is hotter than Canada.
      正确：The weather here is hotter than that in Canada.

3. 用 much/a lot/far 强调程度
   

• This car is much faster than mine.

• The test was far more difficult than I expected.

四、经典例句

• My sister is older than me by three years.

• The movie was more exciting than the book.

• Coffee is less healthy than green tea.

• The farther we walked, the tired we became.

通过掌握这些规则和例子，可以更准确地使用英语比较级进行表达。

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结构 A + be + 形容词比较级 + than + B 是英语中直接比较两个事物（A 和 B）的常见句型。以下是详细说明和例句：

基本规则：

• A 和 B 必须是可比对象（同类事物）。

• 形容词需根据音节数量变形为比较级（加 -er 或前加 more）。

• than 后接比较对象（B），可以是名词、代词或从句。

例句：

• My phone is cheaper than yours. （单音节词 + -er）

• This problem is more complicated than the previous one. （多音节词 + more）

• She is taller than her brother. （隐含比较对象属性）

常见错误与纠正：

• 错误: ~~The cat ismore bigger thanthe dog.~~
     正确: The cat is bigger than the dog. （避免双重比较）

• 错误: ~~His job isstressfuller thanmine.~~
     正确: His job is more stressful than mine. （双音节词以重读闭音节结尾，需用 more）

• 错误: ~~The coffee here isbetter thanStarbucks.~~
     正确: The coffee here is better than that at Starbucks. （比较对象要对等：coffee 与 coffee 比）

特殊用法：

• 比较级前可加 much/far/a lot 强调差异：
     Example: This mountain is much higher than that hill.

• 用 even/still 加强语气：
     Example: The second exam was even harder than the first one.

练习句型：

• Tokyo is __________ (crowded) __________ Paris.

• Learning Chinese is __________ (difficult) __________ learning Spanish.

• My laptop works __________ (fast) __________ yours.

（答案示例：1. more crowded than, 2. more difficult than, 3. faster than）