1. Nominative Singular in Ø; as, ekwa, sena.
Examples of -ia/-i stems are potnia/potni
Those in themes -e, -o, which aren't found very often, can present an -s as well; as in bhidhes (lat. fides)
Those in -a can also rarely present forms in -a; as in gr. lesb. Dika
2. Accusative Singular in -m; as, ekwam, potniam/potnim, bhidhem
3. Vocative Singular in -Ø. It is normally identical to the Nominative, but disambiguation could happen with distinct vowel grades.
4. Genitive Singular in -s; as, ekwas, senas
The theme in -ia/-i/-ia produces a Genitive Singular in -as; as, potnias
5. Oblique Singular in -ai, -a
There is also a form -ei for themes in -e and in -ia.
SINGULAR
| 
 
  | 
 m. ekwa  | 
 m. potnia/i  | 
 m. bhidhe-  | 
| 
 NOM.  | 
 ekwa  | 
 potnia/i  | 
 bhidhes  | 
| 
 ACC.  | 
 ekwam  | 
 potnia/i-m  | 
 bhidhem  | 
| 
 VOC.  | 
 ekwa  | 
 potnia/i  | 
 bhidhe  | 
| 
 GEN.  | 
 ekwas  | 
 potnia/i-s  | 
 bhidhes  | 
| 
 OBL.  | 
 ekwai  | 
 potnai  | 
 bhidei  | 
| 
 
  | 
 adj. f. sen-  | 
| 
 NOM.  | 
 sena  | 
| 
 ACC.  | 
 senam  | 
| 
 VOC.  | 
 sena  | 
| 
 GEN.  | 
 senas  | 
| 
 OBL.  | 
 senai  |