An tuiseal gairmeach
The vocative case
Úsáidtear an tuiseal gairmeach nuair a bhítear ag caint le duine:
The vocative case is used when addressing a person:
a Mharcais
Marcas
a mhic
son
a Shiobhán
Siobhán
An tuiseal tabharthach
The dative case
Bíonn ainmfhocal sa tuiseal tabharthach nuair a bhíonn réamhfhocal simplí + an t-alt roimhe; ní athraíonn deireadh ainmfhocail anois tar éis ar an, ag an, etc. ach athraíonn túschonsain ina ndiaidh, mar a fheicfimid ar ball.
A noun is in the dative case when there is a simple preposition plus the definite article before it; the end of the noun no longer changes after ar an, ag an, etc. but the initial consonant changes after them, as we shall see in later.
D’iarr mé airgead ar an mbean / ar an bhean.
I asked the woman for money.