what is it?
Some Turkish nouns change their final consonant or lose an internal vowel when a vowel-initial suffix is attached. There are two distinct phenomena: consonant softening, where a word-final p / t / k / ç becomes b / d / ğ / c (e.g. kitap → kitabım); and vowel drop, where a disyllabic noun loses the high vowel of its second syllable (e.g. şehir → şehri). Both changes are lexical: they apply only to specific words and must be learned word by word — they are not automatic phonological rules that apply to every noun.
when to use it
Both changes are triggered by the same condition: a vowel-initial suffix is added to the noun. Typical vowel-initial suffixes at A1 include the accusative -(y)ı/i/u/ü, the dative -(y)a/e, and the possessive suffixes -ım/-im/-um/-üm etc.
Consonant softening applies to nouns whose citation form ends in p, t, k, or ç and that are marked for softening in the dictionary. The consonant shifts: p→b, t→d, k→ğ (or g after n), ç→c.
k→ğ is the one general rule: nominals ending in a vowel + k almost always soften to ğ (e.g. çocuk → çocuğum). After n, k softens to g instead (e.g. renk → renge). Recent European loanwords keep k (e.g. bank → bankı).
Vowel drop applies to a closed set of disyllabic nouns whose second syllable contains a high vowel (ı, i, u, ü) between two consonants. That vowel disappears before a vowel-initial suffix: şeh(i)r, ak(ı)l, om(u)z, bur(u)n.
Most words do not change. Before a consonant-initial suffix, no change occurs in either case. Verb roots are largely exempt from both rules.
formation
The tables below show the citation form, the altered stem, and a suffixed output. The suffix used is the accusative or a possessive — both are vowel-initial and trigger the change.
Consonant softening
| citation form | softened stem | suffixed form | meaning |
|---|---|---|---|
| kitap | kitab- | kitabım | my book |
| ağaç | ağac- | ağacı | the tree (acc.) |
| çocuk | çocuğ- | çocuğum | my child |
| renk | reng- | renge | to the colour (dat.) |
Vowel drop
| citation form | stem after drop | suffixed form | meaning |
|---|---|---|---|
| şehir | şehr- | şehri | the city (acc.) |
| akıl | akl- | aklı | his/her mind (acc.) |
| omuz | omz- | omzum | my shoulder |
| burun | burn- | burnu | its nose (acc.) |
Before a consonant-initial suffix, neither change applies: kitap-ta (in the book), şehir-de (in the city) — the stem is unchanged.
examples in context
common pitfalls
Failing to soften p/t/k/ç before a vowel suffix. Forms like *kitapım or *ağaçı are incorrect. The softened forms kitabım and ağacı are required. Check the dictionary entry for each noun.
Confusing the k→ğ, k→g, and k→k patterns. Nominals ending in vowel+k almost always give ğ: çocuk → çocuğu, yaprak → yaprağı. After n, k becomes g: renk → renge. Recent European loans keep k unchanged: bank → bankı. Do not apply ğ universally to all k-final words.
Re-inserting the dropped vowel. Learners sometimes write *akılı, *omuzum (with the accusative), or *şehiri. The correct forms are aklı, omzum, şehri. The second-syllable vowel is absent in the suffixed form.
Over-applying either rule. Most nouns do not soften or drop a vowel: saç → saçım (no softening), top → topum (no softening), bilet → biletim (no softening). Verb roots are also largely exempt. Both changes are lexical — they apply only to the specific words that are listed as undergoing them.