Ⅰ. known as “作為…而出名”;“被稱作…”，as后面的賓語與句子主語是同位的。如：

　　① George is known as a successful banker. 喬治作為成功的銀行家而出名。

　　② The first tomb, known as Chang Ling, was built in the 15th century. 第一座陵墓叫長陵修建于是5世紀。

　　Ⅱ. known by “憑……來判斷或認識”一般不太常用，多出現在某些諺語中。如：

　　① A man is known by the company he keeps. (諺)見其友，知其人。

　　Ⅲ. known for “因……而出名”，for后面多接表示特征、品質之類的詞。如：

　　① Guilin is known for its beautiful sceneries. 桂林因風景優美而聞名。

　　② He is known for his frankness. 他以坦率而出名。

　　Ⅳ. known to “為……所知的”，to后面常接表示人的名詞或代詞。如：

　　① She is known to everyone in the college. 　他在學院里人人皆知。

　　② The usage of that word is known to us all. 這個詞的用法我們人人皆知。