The prepositional case (predlozhnyy padezh) in Russian is primarily used after the prepositions в (in), на (on), and о/об (about). When we talk about plural nouns in this case, the accompanying modifiers—like adjectives and pronouns—must also change to match.
In the prepositional plural, adjectives lose their gender distinctions (masculine, feminine, and neuter all look the same). Most adjectives take the ending -ых. However, if the word ends in a "hushing" consonant (ш, щ, ч, ж) or a velar (г, к, х), it takes -их due to spelling rules.
Possessives like "my," "your," and "our" follow a pattern similar to adjectives, ending in -их.
The word все (all/everyone) changes to всех in the prepositional case. However, note that the word это (this), when used as a general "this is/it is" statement, remains invariable. When used as a modifier ("in these houses"), "these" becomes этих.
Personal pronouns have unique fixed forms in the prepositional case. Note that when the pronoun starts with a vowel, the preposition о often becomes об or обо for easier pronunciation.
Singular:
Plural:
Summary: To master the prepositional plural, focus on the -ykh/-ikh endings for adjectives and possessives, and memorize the specific forms for personal pronouns.
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