麻烦帮我解读分析下下面的英语句子.necessary为什么用副词.

1 be of sth:是- - - ,由- -- 做成.
2 necessarily ：==certainly 它的存在是用来修饰aren't.aren't necessarily----并非一定.
又如：
People who speak English well don't necessarily come from English-speaking countries.Neither are they necessarily those who have lived or studied or worked in those countries.

定语从句， 必须有先行词， 再加关系代词/副词。 这句话的 where it is where it is necessary 在必要的地方我个人认为where是修饰fill的

逗号有问题，缺少成分

伟大的心灵的不一定是那些一直都没能有办法把自己在学校里,已经非常成功在今后的人生中。