The possessive case is often called the genitive.

The nominative and the objective case of a noun are always alike in form. In some pronouns, however, there is a difference (as,—I, me; he, him).

Declension of Nouns

87. The inflection of a substantive is called its declension. To decline a noun is to give its case-forms in order, first in the singular number and then in the plural. Thus,—

Singular
Nominativeboyhorseflychimneycalflassmandeer
Possessiveboy’shorse’sfly’schimney’scalf’slass’sman’sdeer’s
Objectiveboyhorseflychimneycalflassmandeer
Plural
Nominativeboyshorsesflieschimneyscalveslassesmendeer
Possessiveboys’horses’flies’chimneys’calves’lasses’men’sdeer’s
Objectiveboyshorsesflieschimneyscalveslassesmendeer
Nominative Case

88. The nominative case is used in the following constructions: (1) the subject, (2) the predicate nominative, (3) the vocative, (or nominative of direct address), (4) the exclamatory nominative, (5) appositive with a nominative, (6) the nominative absolute.

1. The subject of a verb is in the nominative case.

In the third example, face is the simple subject; the complete subject is the boy’s face. In the fourth, men is the simple subject; the complete subject is a thousand men. Both face and men are in the nominative case; face is in the singular number; men in the plural.