Do you think it -----(必要的)to have a friend who has cool clot

译：你认为有一个穿着很酷的朋友 必要吗?/ 是一件必要的事情么?
先把它换成陈述句语序,更好理解一点：
you think it necessary to have a friend who has cool clothes .
主语：you
谓语：think
形式宾语：it,指代 to have a friend who has cool clothes .
真正的宾语：to have a friend
定语从句（修饰宾语）：who has cool clothes .
宾补：necessary