Latin Third Declension
Third Declension: masculine, feminine and neuter
| Case | Masculine: rēx | Feminine: nāvis | Neuter: corpus |
|---|---|---|---|
| Nominative | rēx / rēgēs | nāvis / nāvēs | corpus / corpora |
| Vocative | rēx / rēgēs | nāvis / nāvēs | corpus / corpora |
| Accusative | rēgem / rēgēs | nāvem / nāvēs | corpus / corpora |
| Genitive | rēgis / rēgum | nāvis / nāvium | corporis / corporum |
| Dative | rēgī / rēgibus | nāvī / nāvibus | corporī / corporibus |
| Ablative | rēge / rēgibus | nāve / nāvibus | corpore / corporibus |
Important rule: third declension neuter nouns have the same form in the nominative and accusative.
In the plural, neuter nominative and accusative end in -a. So:
corpus = body, corpora = bodies.
Another important point: third declension nouns do not all look alike in the nominative singular.
You must learn the genitive singular, because that shows you the stem:
rēx, rēgis, nāvis, nāvis, corpus, corporis.
What the Cases Do
| Case | What it shows | Example |
|---|---|---|
| Nominative | The subject case. It shows who or what is doing the action. | Rēx advenit The king arrives. Nāvis venit Corpus iacet |
| Accusative | Shows the direct object (the person or thing affected by the verb). Also shows movement towards when used with ad. |
Rēgem videō I see the king. Nāvem spectāmus Ad corpus currit |
| Genitive | Shows ownership, quantity, or description. English often uses “of” for this. |
Verba rēgis audiō I hear the words of the king. Multum labōris habet Vir magnae virtūtis est |
| Dative | Shows the indirect object – usually “to” or “for”. Also used with certain common verbs. |
Rēgī dīxī I spoke to the king. Dōnum cīvī dedī Nāvī appropinquat |
| Ablative | Used for many ideas, usually helped by a preposition. Learn to recognise the case, but rely on the preposition to guide you. |
In nāve sedet – He sits in the ship.
Ex urbe venit – He comes out of the city. Ab rēge currit – He runs away from the king. Cum cīvibus ambulat – He walks with the citizens. |
