Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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[*] 110. Adjectives of the First and Second Declensions (ā- and o-stems) are declined in the Masculine like servus , puer , or ager; in the Feminine like stella; and in the Neuter like bellum .

The regular type of an adjective of the First and Second Declensions is bonus, -a, -um, which is thus declined:—

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bonus, bona, bonum, good

[*] Note.--Stems in quo- have nominative -cus (-quos), -qua, -cum (-quom), accusative -cum (-quom), -quam, -cum (-quom), to avoid quu- (see §§ 6. b and 46. N. 2). Thus,—

	MASCULINE STEM bono-	FEMININE STEM bonā-	NEUTER STEM bono-
		SINGULAR
NOM.	bonus	bona	bonum
GEN.	bonī	bonae	bonī
DAT.	bonō	bonae	bonō
ACC.	bonum	bonam	bonum
ABL.	bonō	bonā	bonō
VOC.	bone	bona	bonum
		PLURAL
NOM.	bonī	bonae	bona
GEN.	bonōrum	bonārum	bonōrum
DAT.	bonīs	bonīs	bonīs
ACC.	bonōs	bonās	bona
ABL.	bonīs	bonīs	bonīs

NOM. propincus (-quos）	propinqua	propincum (-quom）
GEN. propinquī	propinquae	propinquī, etc.

But most modern editions disregard this principle.

[*] a. The Genitive Singular masculine of adjectives in -ius ends in -iī, and the Vocative in -ie; not in -ī, as in nouns (cf. § 49. b, c); as, Lacedaemonius , -iī, -ie.

[*] Note.--The possessive meus, my, has the vocative masculine mī (cf. § 145).