Your Welcome. I may not be 100% correct though. It's definite if the definite article an or a possessive thing comes before the noun, so this sentence is literally 'is a nurse her mother' and it would be definite, too, if it was is altra (í) an mháthair 'is a nurse the mother' or 'the mother is a nurse'.
My grammar book gives the following additional possibilities for determining if a particular noun is definite:
- a proper noun referring to a particular person or place;
- a noun qualified by gach ;
- a noun in the vocative case;
- a noun qualified by a numeral that functions as an ordinal (e.g. in bús a dó, bús is definite);
- a noun that governs a definite noun in the genitive (e.g. in teach Phóil, teach is definite because Pól is also).
An Caighdeán Oifigiúil (2012) agrees with your list.
It lists gach aon and gach uile as well as gach.
The only other case I can see is the abbreviated title of an organisation, e.g. AE = An tAontas Eorpach, NA = Na Náisiúin Aontaithe.
I doubt if a new edition of the grammar book will appear as the Christian Brothers are almost extinct in Ireland.