Latin '-um' Ending: 2nd (m/n) Declension
The Latin ending -um shows up in the 2nd (m/n). Here is how to tell which case it is.
Which cases use it
Accusative singular, Nominative singular (neuter)
Example
servum, oppidum
How to tell them apart
If it is a neuter noun, it could be subject or direct object — let the verb dictate.
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