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Was practicing and came across some examples of saying what you are.
看護師をしています
学生です
However, they explained that you cannot say the following:
学生をしています
It would have to be gakusei desu. Why is that? they are both nouns correct?
If i were to guess, it would be because if you are a student, it is constantly, where as if you are a nurse, its something you only do a few hours a day for work?
It's because this type of する means "to work as ～", "to play the role of ～".
する
２㋑ある役割を努める。ある地位にあって働く。また、そのことを仕事として生活をささえる。「司会をする」「仲人をする」「料理長をしている」「商売をする」
娘, 子供, 赤ちゃん and so on are not the name of a role/occupation, so you cannot use する with them. 主婦をしている is okay if you think it's your job.
学生をしている is a gray area case and sometimes people say this as a response to "what's your job?", but it's usually safer to avoid it in a plain self-introduction.
