In Russian, for inanimate nouns (objects and things), the Accusative plural is identical to the Nominative plural. This rule of "Inanimate Accusative = Nominative" extends to adjectives, possessives, and the third-person pronouns when they refer to objects.
Because these modifiers describe inanimate objects, they simply use their Nominative plural forms. They do not change gender in the plural.
While first and second-person pronouns (me, you, us) are always animate, the third-person pronouns can refer to inanimate objects. For inanimate objects in the plural, the Accusative form is их (ikh).
Note: Unlike nouns and adjectives, the third-person personal pronoun их (them) does not match its Nominative form (они - oni). It has a fixed Accusative form.
The demonstrative это (eto) remains invariable when used to identify objects in the plural:
Key Rule: For inanimate plural objects, just use the Nominative plural for everything—except for the personal pronoun "them," which is их.
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