Identify the case and number of each noun.
Then change each form into the singular if it is plural and into the plural if it is singular.
For some, more than one answer is possible.
Example: fīliī
genitive singular fīliōrum
nominative plural fīlius
agrīs
Plural/singular form(s):
lupārum
Plural/singular form(s):
amīcō
Plural/singular form(s):
virōs
Plural/singular form(s):
rīvī
Plural/singular form(s):
animōrum
Plural/singular form(s):