一、用于such…as结构，其中的as为关系代词
I never heard such stories as he tells. 我从未听过他讲的这种故事。
二、such as相当于those who
Such as alter in a moment， win not credit in a month. 那些朝令夕改的人是不会获得人们长久信任的。
此句相当于Those who alter in a moment， win not credit in a month.
Associate with such as will improve your manners. 要和那些能提高你的礼貌修养的人交往。
三、such as相当于what或whatever
此句相当于：
What remains after tax will be yours when I die.
Whatever remains after tax will be yours when I die.
Everything that remains after tax will be yours when I die.
四、such as 用作关系代词，用法上相当于that或which
Then I left it， feeling a weight at my heart such as I had never had before. 然后我离开那里，心头感到一种前所未有的沉重情绪。
Children do not use inflections such as are used in mature adult speech. 孩子们说话时的语调不像成年人那样抑扬顿挫。
