There are basic rules in forming the degrees of comparison: 形成比较度的基本规则有:For one-syllable adjective, add –er to form comparative and –est for superlative. 对于单音节形容词，加-er构成最高级的比较级和最高级的-est。Examples: 例子:clear / clearer / clearest, 清楚dark / darker / ...