3.03 ยท Practice ready Prepositional Singular 0 of 10 lessons complete
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3.03 Prepositional Singular

Location, topic, -ом/-ем and -ой/-ей, with a first full oblique agreement system

Why prepositional comes first

Its adjective endings are regular and its location meanings create a clean contrast for later accusative destinations.

  • The prepositional case occurs only with prepositions. The adjective copies the case, number, and gender of the head noun.
  • Control point: First choose the prepositional relation for the noun phrase; only then choose adjective agreement.
3.03 · Why prepositional comes first · table 1
RelationFrameExample
locationв + prep.в но́вом до́ме
settingна + prep.на но́вой рабо́те
topicо/об + prep.об интере́сной кни́ге
head controlwhole phraseно́вом agrees with до́ме

Masculine and neuter hard -ом

Hard-family masculine and neuter adjectives share prepositional singular -ом.

  • Gender remains a property of the head noun, even though the adjective ending is syncretic across masculine and neuter.
  • Control point: The adjective ending does not predict the noun ending: до́ме, окне́, го́роде, зда́нии follow noun rules.
3.03 · Masculine and neuter hard -ом · table 1
NominativePrepositionalPhrase
но́вый домно́вомв но́вом до́ме
но́вое окно́но́вомв но́вом окне́
ста́рый го́родста́ромв ста́ром го́роде
кра́сное зда́ниекра́сномо кра́сном зда́нии

True soft and sibilant -ем

Genuinely soft and many sibilant-family adjectives use masculine/neuter prepositional -ем.

  • Keep the diagnostic family active. The same visible ending may follow different stem histories.
  • Control point: Stress can change the written vowel after a sibilant: хоро́шем but большо́м.
  • Retrieval checkpoint: Pause and reconstruct the diagnostic forms from the last three lessons without looking, then check what you missed.
3.03 · True soft and sibilant -ем · table 1
NominativePrepositionalPhrase
си́нийси́немо си́нем мо́ре
ле́тнийле́тнемв ле́тнем ла́гере
хоро́шийхоро́шемо хоро́шем враче́
большо́йбольшо́мв большо́м го́роде

Feminine -ой and -ей

Feminine prepositional singular uses -ой or -ей across location and topic constructions.

  • The noun has its own ending; both words must be formed. Genuinely soft and sibilant families commonly show -ей.
  • Control point: Feminine -ой is highly syncretic: the same form will later appear in genitive, dative, and instrumental contexts.
3.03 · Feminine -ой and -ей · table 1
NominativePrepositionalPhrase
но́вая кни́гано́войо но́вой кни́ге
си́няя ру́башкаси́нейв си́ней ру́башке
ру́сская шко́лару́сскойв ру́сской шко́ле
хоро́шая иде́яхоро́шейо хоро́шей иде́е
больша́я ко́мнатабольшо́йв большо́й ко́мнате

Diagnostic families in one table

A compact comparison prevents false hard/soft generalisations.

  • Form the adjective from its stored family, then form the noun independently.
  • Control point: Store four diagnostics when necessary: masculine nominative, feminine nominative, genitive masculine/neuter, and a plural oblique form.
3.03 · Diagnostic families in one table · table 1
FamilyMasc./neut. prep.Fem. prep.
но́выйно́вомно́вой
си́нийси́немси́ней
ру́сскийру́сскомру́сской
хоро́шийхоро́шемхоро́шей
большо́йбольшо́мбольшо́й

Location with в

в + prepositional places an activity, state, or object inside a setting.

  • The verb does not need to be motionless. What matters is whether the phrase locates the event rather than naming its endpoint.
  • Control point: Do not reduce the contrast to 'movement versus no movement'. Endpoint meaning, not the presence of motion, selects accusative.
  • Retrieval checkpoint: Pause and reconstruct the diagnostic forms from the last three lessons without looking, then check what you missed.
3.03 · Location with в · table 1
ExampleLocated elementMeaning
Мы живём в но́вом до́ме.livinginside the house
Она́ рабо́тает в ру́сской шко́ле.workingat/in the school
Де́ти бе́гают в большо́м па́рке.runningactivity located in park
Кни́га лежи́т в си́ней су́мке.bookinside bag

Location and setting with на

на + prepositional covers surfaces and many conventional activity, event, and institutional frames.

  • The choice between в and на is partly lexical. Learn common place frames with the noun and adjective together.
  • Control point: Translate the whole place relation, not an isolated English preposition.
3.03 · Location and setting with на · table 1
FrameExampleCategory
на столе́на большо́м столе́surface
на рабо́тена но́вой рабо́теactivity/institution
на уро́кена интере́сном уро́кеevent
на стадио́нена но́вом стадио́неconventional place frame

Topic with о and об

о/об + prepositional marks the topic of speech, thought, writing, or information.

  • Use об before many vowel-initial sound groups to avoid hiatus. The case remains prepositional throughout the phrase.
  • Control point: Choose о/об for pronunciation, then form the same prepositional agreement pattern.
3.03 · Topic with о and об · table 1
FrameExampleTopic
оо но́вом прое́ктеa new project
оо ру́сской литерату́реRussian literature
обоб интере́сной исто́рииan interesting story
обоб о́пытном учи́телеan experienced teacher

Second-locative nouns keep ordinary adjectives

A restricted noun ending -у/-ю does not create a special adjective locative ending.

  • The adjective uses the ordinary prepositional form while a small lexical set of masculine nouns may use a stressed second locative for location.
  • Control point: The special form belongs to the noun. The agreeing adjective remains prepositional singular.
  • Retrieval checkpoint: Pause and reconstruct the diagnostic forms from the last three lessons without looking, then check what you missed.
3.03 · Second-locative nouns keep ordinary adjectives · table 1
LocationTopic/ordinary prep.Contrast
в густо́м лесу́о густо́м ле́сеlocation vs. topic
на но́вом мосту́о но́вом мо́стеlocation vs. topic
в да́льнем углу́о да́льнем угле́location vs. ordinary form
в но́вом шкафу́о но́вом шка́феlocation vs. topic

Prepositional singular assessment

Select the preposition and relation, then form both adjective and noun.