The Subjective Inflection is used to indicate the subject noun and/or that the word is the subject of a “to be” statement.
Here is the full list on how it changes per noun class and the variations of each.
Strong-I Neuter: the variable noun undergoes a-fortification, so [a à â], [i à ê], [u à ô], etc.
Strong-I Common: add -an to the end.
Strong-I Feminine: add -in to the end.
Strong-I Masculine: add -un to the end.
Strong-II Neuter: the variable noun undergoes a-fortification, so [a à â], [i à ê], [u à ô], etc.
Strong-II Common: add -n to the end.
Strong-II Feminine: add -n to the end.
Strong-II Masculine: add -n to the end.
Weak-I Neuter: add -a to the end.
Weak-I Common: add -an to the end.
Weak-I Feminine: add -in to the end.
Weak-I Masculine: add -un to the end.
Weak-II Neuter: nothing.
Weak-II Common: add -n to the end.
Weak-II Feminine: add -n to the end.
Weak-II Masculine: add -n to the end.