一句英语句子帮忙分析一下

好像是悼词来着 。。

同位语是the representative of a family in grief，是you的同位语

分下句子I stand before you today ，the representative of a family in grief ,in a country in mourning ，before a world in shock.

in a country in mourning ，before a world in shock 这两个介词短语是状语