Sanskrit Grammar - Declension Table - Noun - Gender Number Case

In Sanskrit grammar, forming the plural of a word isn't a simple "add an -s" like in English. 

Sanskrit is a highly inflected language with 

3 Genders (masculine, feminine, neuter)

3 Numbers (singular, dual, and plural), and 

8 Cases 

(nominative, vocative, instrumental, accusative,  dative, ablative, genitive, and locative).

Declension table of Rama

Singular

C1    Subject   रामः 
C2    Object    रामम्
C3    By, with, through, Because of, Due to रामेण
C4    For, To  रामाय
C5    From   रामात्
C6    Of     रामस्य
C7    In; On, At रामे
C8    Oh    हे राम

Case

1 Nominative Subject of the action:रामः (Rāmaḥ) – Rama.

2 Accusative Object:  रामम् (Rāmam) – Ram(a).

3 Instrumental “by means of”:  रामेण (Rāmeṇa) – With Rama.

4 Dative For   रामाय (Rāmāya) – For Rama.

5 Ablative  From  रामात् (Rāmāt) – Away from Rama.

6 Genitive  Of   रामस्य (Rāmasya) – Of Rama. 

7 Locative On or In रामे (Rāme) – In/at Rama.

8 Vocative  is the person being spoken to:  हे राम (He Rāma) – O Rama!

https://sanskritstudio.wordpress.com/2014/09/05/the-sanskrit-masculine-declension-1-stem-in-a/