Sounds a bit poetic to me.Normal English speech would be "You are only an engineer"
I did nil ionaibh ach and they said it was wrong.
Ionaibh would make more sense with innealtóirí.
níl ach innealtóir ionat freisin?
b'fhéidir - má tá innealtóir ite agat.
i dont understand why it uses Nil instead of Ni. isn't this a classification?
This idiom only uses níl + i prepositional pronoun + ach.