一般情况下，直接在形容词后加er或est；以不发音的e结尾的形容词，直接在其后加r或st；结尾只有一个元音字母和一个辅音字母的，双写最后的一个辅音字母，再加er或est；以“辅音字母+y”结尾的形容词，变y为i再加er或est；两个或两个以上的形容词，比较级前加more，最高级前面加most。
比较级句子I'm taller than you.
He's shouter than her.
I can run faster than you.
The one is much better than that one.
The one is cheaper than that one.
最高级句子I'm the tallest people in my class.
The dress is the longest one.
You can run fastest in the class.
The one is the best one in the shop.
Your dress is the most pretty one.
