比较级后面通常 加形容词或副词来表示两个或多个事物之间的程度差异。以下是一些具体的例子和说明：
加形容词或副词
She is tallerthan her sister.
This book is more interestingthan that one.
加一些特定的副词
He runs fasterthan me.
She sings more beautifullythan her brother.
加名词
This is the tallestbuilding in the city.
She is the smarteststudent in our class.
加代词
This is mybook, and that is yourbook.
He is mybrother, and she is hissister.
加动词的ing形式（动名词）
She enjoys readingmore than watching TV.
He works harderthan his brother.
加一些特定的短语
She is a littletaller than her sister.
He is muchstronger than before.
需要注意的是，有些不规则形容词或副词的比较级形式需要特别记忆，例如：
good → better → best
bad → worse → worst
far → farther/further → farthest/furthest
总的来说，比较级后面可以加的词性主要是形容词或副词，以及一些特定的副词和短语。这些词性用于描述或比较两个或多个事物之间的程度差异。