In Russian, the Accusative Case is primarily used for the direct object of a sentence (the thing receiving the action). When dealing with inanimate nouns (objects, concepts, things that aren't alive), the rules for adjectives and pronouns are quite straightforward because many forms look exactly like the Nominative Case.
For inanimate objects, Masculine and Neuter adjectives do not change. Only Feminine adjectives take a distinct ending.
Short Adjectives: Generally, short adjectives (weak forms) like готов (gotov) do not change when used with inanimate nouns in this context.
Possessive pronouns like "my" or "your" follow a similar pattern: Masculine and Neuter stay the same as the Nominative, while Feminine changes.
The word это (eto), when used to mean "this is" or "it is," is invariable and does not change regardless of the gender or case of the noun following it.
The word for "all" or "whole" (весь), however, does change to agree with the noun:
When asking "what" (for inanimate objects), we use что (chto). It remains что in the Accusative. This contrasts with кто (kto) for "who," which changes to кого (kogo).
Personal pronouns always change in the Accusative, regardless of whether they refer to people or things:
Summary: For inanimate objects, remember that Masculine and Neuter are your friends—they usually stay the same as the Nominative. Focus your attention on the Feminine, which almost always changes its ending!
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