1. Third Declension Review Noun/Adjective Agreement
Latin II
Feb. 3-7, 2014

2. -is 3rd declension nouns Third declension nouns are identified by the
–is ending in the genitive singular.
pax, pacis (f.)
lex, legis (f.)
salus, salutis (f.)
dux, ducis (m.)
-is

3. 3rd Declension Endings --- -ēs -is -um -i -ibus -em -ēs -e -ibus
Singular Plural
Nominative*
Genitive
Dative
Accusative
Ablative
---
-ēs
-is
-um -i
-ibus
-em
-ēs -e
-ibus
* There are several nominative endings, so they’re not
listed on the chart. Whatever the first form of the word is
in your vocabulary list…that’s the nominative.

4. Has a different spelling
Step 1 – Find the noun stem
The noun stem is found by dropping the genitive singular ending from the noun.
Dictionary entry of a noun:
pax, pacis, f peace
Often the stem
Has a different spelling
Than the nominative!
Nominative singular
Gender
Meaning
Genitive singular
pacis – is = pac
Noun Stem

5. Step 2: Add the case endings to the noun stem.
Singular Plural
Nominative
Genitive
Dative
Accusative
Ablative
dux
duc
Note that the
lovely nominative form will appear once on the chart, then disappear…like a briefly-lived bug. 
duc
duc
duc
duc
duc
duc
duc
duc
ibus
ibus
dux, ducis (m.) e es is em es i um

6. Your Turn! Decline salus, salutis (f.) on your whiteboard.
salus salutes
salutis salutum
saluti salutibus
salutem salutes
salute salutibus

7. Nouns and Adjectives
The adjectives you have learned thus far are called “1st/2nd declension adjectives”
bonus, bona, bonum
Therefore, they do not use 3rd declension endings!

8. bonus, bona, bonum Nom. bonus boni Gen. boni bonorum Dat. bono bonis
Acc bonum bonos
Abl bono bonis
Masculine forms use 2nd declension endings.
Nom bona bonae
Gen bonae bonarum
Dat bonae bonis
Acc bonam bonas
Abl bonā bonis
Feminine forms use 1st declension endings.
Nom bonum bona
Gen boni bonorum
Dat bono bonis
Acc bonum bona
Abl bono bonis
Neuter forms use 2nd declension neuter endings.

9. Nouns and Adjectives Remember our old abbreviation G-N-C?
Nouns and adjectives agree in gender, number, and case.
They DO NOT have to agree in declension!
This means: often nouns and adjectives have endings that AGREE but AREN’T SPELLED the same way.

10. Lex Bona
Singular
Plural
Nom. lex bona leges bonae Gen. legis bonae legum bonarum Dat. legi bonae legibus bonis Acc. legem bonam leges bonas Abl. lege bonā legibus bonis

11. Your Turn!
Decline “pax magna” on a single chart on the whiteboard (pax, pacis)
pax magna paces magnae
pacis magnae pacum magnarum
paci magnae pacibus magnis
pacem magnam paces magnas
pace magnā pacibus magnis

12. Decline “dux bonus” on a single chart. (dux, ducis)
dux bonus duces boni
ducis boni ducum bonorum
duci bono ducibus bonis
ducem bonum duces bonos
duce bono ducibus bonis

13. Decline “rex malus” on a single chart. (rex, regis)
rex malus reges mali
regis mali regum malorum
regi malo regibus malis
regem malum reges malos
rege malo regibus malis

14. Decline “arbor pulchra” on a single chart. (arbor, arboris)
arbor pulchra arbores pulchrae
arboris pulchrae arborum pulcrarum
arbori pulchrae arboribus pulchris
arborem pulchram arbores pulchras
arbore pulchrā arboribus pulchris