A2 Morphology 1 min read Moyen

Vowel Alternations in Locative (e.g., ruka -> ruci)

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Grammar Rule in 30 Seconds

When feminine nouns ending in K, G, or H move to the Locative case, those letters change to C, Z, or S.

  • K becomes C: ruka (hand) → u ruci (in the hand)
  • G becomes Z: knjiga (book) → u knjizi (in the book)
  • H becomes S: svrha (purpose) → o svrsi (about the purpose)
Noun(K/G/H) + Locative '-i' ➔ Noun(C/Z/S)i

Sibilarization in Feminine Nouns (Locative/Dative)

Nominative Stem End Locative/Dative English
Ruka
K
Ruci
Hand
Knjiga
G
Knjizi
Book
Svrha
H
Svrsi
Purpose
Noga
G
Nozi
Leg
Slika
K
Slici
Picture
Briga
G
Brizi
Worry
Snaga
G
Snazi
Strength
Majka
K
Majci
Mother

Meanings

A phonetic process where the velar consonants K, G, and H transform into the dental sibilants C, Z, and S when followed by the vowel 'i' in specific grammatical cases, most notably the Locative and Dative singular of feminine nouns.

1

Locative/Dative Singular (Feminine)

The most common usage for A2 learners, occurring when describing locations or targets for feminine nouns ending in -a.

“Sjedim na nogama.”

“Pišem o toj knjizi.”

2

Nominative Plural (Masculine)

Used when forming the plural of masculine nouns ending in K, G, or H.

“Vuk -> Vuci (Wolves)”

“Učenik -> Učenici (Students)”

3

Imperative Mood

Certain verbs undergo this change in their command forms.

“Peci! (from peći, root pek-)”

“Tezi! (from teći, root teg-)”

Reference Table

Reference table for Vowel Alternations in Locative (e.g., ruka -> ruci)
Case Gender Ending Example (Nom) Example (Changed)
Locative Sing.
Feminine
-i
Ruka
U ruci
Dative Sing.
Feminine
-i
Knjiga
Knjizi
Nominative Plur.
Masculine
-i
Učenik
Učenici
Dative Plur.
Masculine
-ima
Vuk
Vucima
Locative Plur.
Masculine
-ima
Vuk
Vucima
Instrumental Plur.
Masculine
-ima
Vuk
Vucima
Imperative
Verb
-i
Rek- (root)
Reci!

Spectre de formalité

Formel
Navedena informacija se nalazi u knjizi.

Navedena informacija se nalazi u knjizi. (General information)

Neutre
To piše u knjizi.

To piše u knjizi. (General information)

Informel
Vidi u knjizi.

Vidi u knjizi. (General information)

Argot
Ma, imaš to u knjizi, buraz.

Ma, imaš to u knjizi, buraz. (General information)

The Sibilarization Triangle

K, G, H

K

  • C as in Ruci

G

  • Z as in Knjizi

H

  • S as in Svrsi

Sibilarization vs. No Change

Common Nouns (Change)
Ruka -> Ruci Hand
Names (No Change)
Luka -> Luki Luka (Name)

Should I change the consonant?

1

Does it end in K, G, or H?

YES
Next step
NO
No change
2

Is it a personal name?

YES
No change
NO
Next step
3

Is it a hypocoristic (e.g. Baka)?

YES
No change
NO
Apply Rule

Common Words with Sibilarization

🦶

Body

  • • Ruci
  • • Nozi
📚

Objects

  • • Knjizi
  • • Slici
💡

Abstract

  • • Svrsi
  • • Odluci
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Exemples par niveau

1

Knjiga je u ruci.

The book is in the hand.

2

Ona piše u knjizi.

She is writing in the book.

3

Stojim na jednoj nozi.

I am standing on one leg.

4

Daj to majci.

Give that to mother.

1

U ovoj priči nema istine.

There is no truth in this story.

2

Na toj slici je moja kuća.

In that picture is my house.

3

Idem prema ljekarni.

I am going towards the pharmacy.

4

Reci mi sve o toj knjizi.

Tell me everything about that book.

1

U toj svrsi koristimo nove alate.

For that purpose, we use new tools.

2

Oni su pravi junaci.

They are real heroes.

3

U ovoj epohi sve je moguće.

In this epoch, everything is possible.

4

Bili smo u velikoj brizi.

We were in great worry.

1

U toj juhi ima previše soli.

There is too much salt in that soup.

2

Divim se tvojoj snazi.

I admire your strength.

3

U toj su se bitci borili hrabro.

They fought bravely in that battle.

4

Odluka leži u tvojoj odluci.

The decision lies in your decision.

1

U toj se psihologiji krije odgovor.

The answer lies in that psychology.

2

Nalazimo se u kritičnoj točki.

We are at a critical point.

3

U toj se zagonetki krije tajna.

A secret is hidden in that riddle.

4

Oni su vrsni stručnjaci.

They are top experts.

1

U toj se monografiji detaljno opisuje proces.

The process is described in detail in that monograph.

2

Pristupili smo toj problematici ozbiljno.

We approached that problematic seriously.

3

U toj se idili krije opasnost.

Danger is hidden in that idyll.

4

Oni su bili pobjednici u toj utrci.

They were the winners in that race.

Facile à confondre

Vowel Alternations in Locative (e.g., ruka -> ruci) vs Palatalizacija

Both involve KGH changing sounds. Learners mix up which vowel triggers which change.

Vowel Alternations in Locative (e.g., ruka -> ruci) vs Jotacija

Jotacija also changes consonants but is triggered by 'j'.

Vowel Alternations in Locative (e.g., ruka -> ruci) vs Exceptions for Names

Learners want to be consistent and change everything.

Erreurs courantes

✗

u ruki

✓

u ruci

Forgot to change K to C.
✗

u knjigi

✓

u knjizi

Forgot to change G to Z.
✗

na nogi

✓

na nozi

Forgot to change G to Z.
✗

o svrhi

✓

o svrsi

Forgot to change H to S.
✗

u Luci

✓

u Luki

Applied the rule to a personal name (Luka).
✗

mojoj baci

✓

mojoj baki

Applied the rule to a hypocoristic (grandmother).
✗

u točki

✓

u točci

Standard Croatian prefers 'točci', though 'točki' is common in speech.
✗

u eposi

✓

u epohi

Loanwords like 'epoha' often resist sibilarization.
✗

u psihi

✓

u psisi

Over-correcting a loanword that should not change.
✗

vuki

✓

vuci

Forgetting the change in masculine plural.
✗

u mazzi

✓

u mazgi

Applying the rule where it would create an awkward consonant cluster.
✗

u zagonetci

✓

u zagonetki

In modern standard, some -tka words prefer no change for clarity.

Structures de phrases

U ___ (noun) se nalazi ___.

Pričamo o ___ (noun).

Daj to ___ (person/noun).

Oni su ___ (masculine plural).

Real World Usage

Texting friends very common

Javi kad budeš u ruci s kavom!

Job Interview common

U ovoj sam knjizi opisao svoje iskustvo.

Ordering Food occasional

Može li bez soli u juhi?

Social Media very common

Nova slika! Pogledajte me na ovoj slici.

Travel/Directions constant

Skrenite na prvoj točci.

Doctor's Visit common

Boli me u ovoj nozi.

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💡

The 'Baka' Rule

If a word is 'cute' or a family nickname (hypocoristic), don't change it. 'Baki', 'seki', 'mami' are all safe.
⚠️

Names are Sacred

Never change the 'k' in a person's name. It's 'Luki', not 'Luci', unless you want to confuse them with a girl named Luce!
🎯

Listen for the 'S'

The H to S change is rare. If you hear 'svrsi', you're hearing a high-level speaker. Practice it to sound more native.
💬

Dialectal Freedom

In Zagreb, you might hear 'u ruki'. Don't panic; they are just being casual. But in your exam, use 'u ruci'!

Smart Tips

Stop and think of the word 'učenici' (students). If you know 'učenici', you know K becomes C!

U ruki. → U ruci.

Ignore the rule! Names are 'protected' from sibilarization.

Idem k Anci. → Idem k Anki.

Think of a Zebra. G becomes Z.

U knjigi. → U knjizi.

Keep the stem stable. Modern loanwords often skip the old Slavic shifts.

U psihologizi. → U psihologiji.

Prononciation

/rutsi/

Soft C

The 'C' in 'ruci' is always dental (like 'ts' in 'cats'), never like 'k'.

/kɲizi/

Voiced Z

The 'Z' in 'knjizi' is voiced, like the 'z' in 'zebra'.

/svrisi/

Sharp S

The 'S' in 'svrsi' is a sharp hiss, like 'snake'.

Falling tone on 'i'

u rùci ↘

Standard locative emphasis.

Mémorise-le

Moyen mnémotechnique

Keep Great Hopes (KGH) to See Zebra Clouds (CZS).

Association visuelle

Imagine a King (K) turning into a Cat (C), a Giant (G) turning into a Zebra (Z), and a Hero (H) turning into a Snake (S) as they walk into a room labeled 'Locative'.

Rhyme

K to C, G to Z, H to S, makes your Locative a success!

Story

Luka was holding a 'knjiga' in his 'ruka'. He stepped into the Locative library, and suddenly the 'knjiga' was 'u knjizi' and his 'ruka' was 'u ruci'. He was so surprised he stood on one 'nozi'!

Word Web

rukaknjigasvrhanogaslikamajkaučenikvuk

Défi

Look around your room. Find three things that end in -ka or -ga. Say 'It is in the [thing]' using the correct sibilarization form.

Notes culturelles

The standard language is very strict about these changes in formal writing.

In some northern dialects, these changes are often skipped in casual speech.

Dalmatians might shorten the ending, but the sibilarization usually remains.

This comes from the Second Slavic Palatalization, which occurred around the 6th or 7th century AD.

Amorces de conversation

“

Što držiš u ruci?

“

O kojoj knjizi voliš pričati?

“

U kojoj se svrsi koristi ovaj alat?

“

Na kojoj si nozi stajao kad si pao?

Sujets d'écriture

Opiši što se nalazi u tvojoj omiljenoj knjizi.
Napiši kratku priču o dječaku koji je imao čarobnu moć u svojoj ruci.
Raspravi o svrsi obrazovanja u današnjem svijetu.
Opiši sliku koja visi na tvom zidu.

Erreurs courantes

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

Incorrect

Correct

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Test Yourself

Fill in the correct form of the noun in brackets.

Knjiga je u ___ (ruka).

✓ Correct! ✗ Not quite. Correct answer: ruci
K changes to C in the Locative case for 'ruka'.
Which sentence is grammatically correct? Choix multiple

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: b
G changes to Z in the Locative case for 'knjiga'.
Correct the mistake in the sentence. Error Correction

Find and fix the mistake:

Stojim na jednoj nogi.

✓ Correct! ✗ Not quite. Correct answer: nozi
The correct Locative of 'noga' is 'nozi'.
Change the masculine noun to plural. Sentence Transformation

Učenik je ovdje. -> ___ su ovdje.

✓ Correct! ✗ Not quite. Correct answer: Učenici
Masculine nouns ending in K change to C in Nominative plural.
Is the following statement true or false? True False Rule

Personal names like 'Luka' undergo sibilarization in the Dative case.

✓ Correct! ✗ Not quite. Correct answer: False
Personal names are usually exceptions to preserve the name's identity.
Complete the dialogue. Dialogue Completion

- Gdje je tvoja sestra? - Ona je u ___ (ljekarna).

✓ Correct! ✗ Not quite. Correct answer: ljekarni
'Ljekarna' does not end in K, G, or H, so no consonant change occurs.
Sort the words into 'Change' or 'No Change' in Locative. Grammar Sorting

Words: Ruka, Baka, Knjiga, Luka

✓ Correct! ✗ Not quite. Correct answer: a
Common nouns change; hypocoristics and names don't.
Match the Nominative with the Locative. Match Pairs

Match each item on the left with its pair on the right:

✓ Correct! ✗ Not quite. Correct answer: a
H->S, G->Z, K->C.

Score: /8

Exercices pratiques

8 exercises
Fill in the correct form of the noun in brackets.

Knjiga je u ___ (ruka).

✓ Correct! ✗ Not quite. Correct answer: ruci
K changes to C in the Locative case for 'ruka'.
Which sentence is grammatically correct? Choix multiple

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: b
G changes to Z in the Locative case for 'knjiga'.
Correct the mistake in the sentence. Error Correction

Find and fix the mistake:

Stojim na jednoj nogi.

✓ Correct! ✗ Not quite. Correct answer: nozi
The correct Locative of 'noga' is 'nozi'.
Change the masculine noun to plural. Sentence Transformation

Učenik je ovdje. -> ___ su ovdje.

✓ Correct! ✗ Not quite. Correct answer: Učenici
Masculine nouns ending in K change to C in Nominative plural.
Is the following statement true or false? True False Rule

Personal names like 'Luka' undergo sibilarization in the Dative case.

✓ Correct! ✗ Not quite. Correct answer: False
Personal names are usually exceptions to preserve the name's identity.
Complete the dialogue. Dialogue Completion

- Gdje je tvoja sestra? - Ona je u ___ (ljekarna).

✓ Correct! ✗ Not quite. Correct answer: ljekarni
'Ljekarna' does not end in K, G, or H, so no consonant change occurs.
Sort the words into 'Change' or 'No Change' in Locative. Grammar Sorting

Words: Ruka, Baka, Knjiga, Luka

✓ Correct! ✗ Not quite. Correct answer: a
Common nouns change; hypocoristics and names don't.
Match the Nominative with the Locative. Match Pairs

1. Svrha, 2. Noga, 3. Slika

✓ Correct! ✗ Not quite. Correct answer: a
H->S, G->Z, K->C.

Score: /8

FAQ (8)

It's due to a historical sound shift called Sibilarization. The 'k' softens to 'c' before the 'i' ending to make it easier to pronounce.

Yes, for masculine nouns in the Nominative plural (e.g., `učenik` -> `učenici`) and Dative/Locative/Instrumental plural (e.g., `vucima`).

Personal names are exceptions. We say `Luki` to keep the name recognizable.

Both are used, but `točci` is the traditional standard. However, many modern speakers prefer `točki` to keep the root clear.

Yes, in the imperative (commands) of some verbs, like `reci` (tell) from the root `rek-`.

Hypocoristics (family nicknames) usually resist the change to maintain their 'cute' and recognizable form.

Yes, the rule is virtually identical in Serbian, Bosnian, and Montenegrin.

Use the mnemonic: **K**ats **C**limb, **G**iraffes **Z**igzag, **H**ippos **S**wim.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

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In Other Languages

Spanish none

None

Spanish maintains the 'k' sound (written as 'qu') in 'amigo -> amigos'.

French partial

C/G softening

French changes are purely phonetic, while Croatian changes are triggered by grammar.

German low

Umlaut

German changes vowels; Croatian changes consonants.

Japanese moderate

Te-form alternations

Japanese applies this to verbs; Croatian applies it mostly to nouns.

Arabic low

Root system

Arabic root consonants are stable; Croatian ones are not.

Chinese none

None

Chinese has no grammatical cases.

Learning Path

Prerequisites

Previous
Locative with Time Expressions (e.g., u tjednu)

Related Grammar Rules

C2

Subtle Semantic Distinctions between Synonyms and Near-Synonyms
C1

Understanding Etymology and Word Families
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