pretty的比较级形式是prettier。The comparative of "pretty" is "prettier".在这一单元中, 有许多形容词, 请依据前面所讲,写出他们的比较级.In this unit, are many adjectives. Please write their comparatives.比较级可以通过词形或者语义来实现.The degree of comparison can be express...

“比较级”的英语可以翻译为：comparative degree ...