According to a study conducted by UNESCO, over 200 ethnic languages went extinct in 2004, primarily due to the linguistic assimilation of ethnic minorities into the english language.
1. 句子结构——
-- 主要成分：over 200 ethnic languages went extinct in 2004 ——200多种语言在2004年已经消失.
-- 方式状语According to a study conducted by UNESCO ——根据联合国教科文组织指导进行过的研究；
-- 原因状语：primarily due to the linguistic assimilation of ethnic minorities into the English language 主要是由于少数种族的语言同化为英语.
2. went extinct 是系表结构,went 在这里是系动词,表示“逐步变成”,系动词后只能跟表语,不能有病与.意思后面的形容词 extinct 是表语,意思是“逐步变成了消失的状态”.