l just finished reading this book.l found it easy to read.为什么easy不可以换为easier?

题目

l just finished reading this book.l found it easy to read.为什么easy不可以换为easier?

答案

如果用easier,则表示比较,后面还要加东西,例如：I just finished reading this book.I found it easier to read than the one I read before.