I’ll feel very proud of have been a student of graduate school at XXX University,and will do my best to contribute to my alma mater.这句话有语法错误嘛?

I’ll feel very proud of have been a student of graduate school at XXX University,
and will do my best to contribute to my alma mater.
这句话有语法错误嘛?

你好.完善后的句子是：
I’ll feel very proud of having been a student of a graduate school at -- - University.

第一个of 后动词应为ING，

have 改为 having 介词of 后面是-ing形式

I’ll feel very proud of having been a student graduated school at XXX University and I will do my best to contribute to my alma mater.

of 后要用ing形式，
student 用从句或过去分词短语作定语； 原句去掉of 换成分词短语了