Question

i'm three years -______(young) than my brother,讲讲为什么？

为什么比较级前可以加数字？

Answer 1

younger

原因如下：参考比较级的语法
比较级前的修饰语
在使用比较级的时候，宏册为使比较的程度更加确切，可以在比较级前加上一些修饰语，这些修饰语有：
1．数词短语，用来表示具体的数量
My sister is two years older than I.
2．a little, a bit表示“一点儿”，稍微之意
She is a little shorter than Han Mei.
This book is a bit thicker than that one.
3．some（肯定句），any（否定句、疑问句），表“…一些”
I’m feeling some better.
The man was too tired to go any farther.
4. much, a lot, by far表示“…得多”
Out school is much more beautiful than it was before.
5．Still, even表“…更…”，“…还是…”
My watch is expensive, but this is even more expensive
注：very, quite,more等词丛芹一般用来修饰形渗绝毕容词、副词的原级，不能用来修饰比较级。

Answer 2

比你的弟兄小3岁。
这是一种习惯用法。

Answer 3

younger