Consonant Changes: One-Page Summary | Turkish Grammar

You have met Turkish's consonant changes one at a time: softening here, devoicing there, hardening somewhere else. The problem with learning them separately is that they don't happen separately — when you attach a suffix, two or three of them can fire at once, and the only way to spell the result correctly is to run the whole system in your head together. This page gathers every alternation onto a single sheet, each with its trigger and one clean example, so you can stop treating them as scattered rules and start applying them as one coordinated mechanism. Keep this page open while you drill; it is the cheat sheet the others build toward. (For the conceptual "why," see the mutation overview.)

The cast of characters: the voiceless set

Everything on this page is driven by voicing. One group of consonants does the driving — the voiceless set:

p, ç, t, k, s, ş, h, f (mnemonic: "Fıstıkçı Şahap" — a phrase containing exactly these eight)

A useful chunk of that set are the four voiceless stops p, ç, t, k, each with a voiced partner: p↔b, ç↔c, t↔d, k↔ğ/g. Softening turns a voiceless stop into its voiced partner; hardening and devoicing push the other way. The voiceless set as a whole (all eight) is what triggers suffix hardening. Get this set memorized — Fıstıkçı Şahap, "Şahap the pistachio-seller" — and every rule below becomes mechanical.

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Memorize the eight voiceless consonants with the name Fıstıkçı Şahap (p, ç, t, k, s, ş, h, f). A stem that ends in one of these hardens the suffix's first consonant; the four voiceless stops among them (p, ç, t, k) can themselves soften before a vowel. One sound-set, two rules.

The four rules at a glance

Here is the entire system. Read it once across, then keep it for reference.

Rule	What changes	Trigger	Example
Stem-final softening	p→b, ç→c, t→d, k→ğ/g (at the end of a stem)	a vowel-initial suffix lands on it	kitap → kitabı
Suffix hardening (D→t)	the suffix's initial D becomes t	stem ends in a voiceless consonant (Fıstıkçı Şahap)	çiçek + -DA → çiçekte
Suffix hardening (C→ç)	the suffix's initial C becomes ç	stem ends in a voiceless consonant	simit + -CI → simitçi
Final devoicing	a word-final voiced stop b, c, d, g surfaces as p, ç, t, k	the stem stands alone (no vowel suffix)	kitab- → kitap

The two big families pull in opposite directions. Softening (rule 1) and devoicing (rule 4) are two sides of one coin: the stem is underlyingly voiced, devoices at the word edge, and re-voices when a vowel suffix protects it. Hardening (rules 2 and 3) is about the suffix: a voiceless stem refuses to let the suffix start with a voiced consonant, so D→t and C→ç. Everything else is detail.

Rule 1 — Stem-final softening (before a vowel)

A stem ending in p, ç, t, k softens to b, c, d, ğ/g when a vowel-initial suffix attaches. The change is written, not just spoken. (Full treatment: softening p→b, ç→c, t→d and k→ğ/g.)

Kitabı masaya bırak, sonra okuruz.

Leave the book on the table, we'll read it later.

Bu ağacın gölgesinde biraz dinlenelim.

Let's rest a little in the shade of this tree.

Çocuğa bir hikâye anlattım, hemen uyudu.

I told the child a story and he fell asleep right away.

Here kitap → kitabı (p→b), ağaç → ağacın (ç→c), and çocuk → çocuğa (k→ğ). In each, the suffix begins with a vowel, so the underlying voiced consonant surfaces.

Rule 2 — Suffix hardening D→t (after a voiceless consonant)

Suffixes whose dictionary shape starts with D — the locative -DA, ablative -DAn, past -DI, and the converb -DIkçA — harden that D to t when the stem ends in a voiceless consonant (any of Fıstıkçı Şahap). (Full treatment: the D→t rule.)

Sınıfta kimse yoktu, herkes bahçeye çıkmıştı.

There was no one in the classroom; everyone had gone out to the garden.

Kitaptan güzel bir alıntı okudum sana.

I read you a nice quotation from the book.

Otobüs durağında yarım saat bekledim.

I waited half an hour at the bus stop.

So sınıf (ends in f, voiceless) + -DA → sınıfta; kitap (ends in p) + -DAn → kitaptan; durak (ends in k) + locative → durakta (and note durağında with the genitive-possessive shows softening — same word, both rules in play depending on the suffix's first sound). After a voiced sound, the D stays: evde ("at home," ev ends in voiced v), denizde ("in the sea").

Rule 3 — Suffix hardening C→ç (after a voiceless consonant)

The same logic applies to suffixes starting with C — chiefly the agent/profession suffix -CI ("one who does X") and the diminutive -CIk. After a voiceless consonant they harden to -çI and -çIk.

Köşedeki simitçiden iki simit aldım.

I bought two simits from the simit-seller on the corner.

Küçük bir kuşçuk pencereye kondu.

A little bird landed on the window.

So simit (ends in t) + -CI → simitçi; kuş (ends in ş) + -CIk → kuşçuk. After a voiced sound, C stays: yolcu ("traveler," yol ends in voiced l), gözcü ("lookout").

Rule 4 — Final devoicing (the citation form)

A stem that is voiced underlyingly cannot end a word in a voiced stop, so b, c, d, g devoice to p, ç, t, k when the word stands alone. This is why dictionary forms look "hard" even though softening reveals a soft stem. It's the mirror image of rule 1.

Kitap nerede? — Az önce elimdeydi, kayboldu.

Where's the book? — It was in my hand just now; it's vanished.

Bu renk bana çok yakıştı, değil mi?

This color suited me well, didn't it?

The stem of kitap is really kitab- (you see the b in kitabı); standing alone, the b devoices to p. Same with renk / rengi (g→k at the edge). The inflected form shows the truth; the citation form is the disguise.

The big caveat: many words do NOT soften

Softening (rule 1) is the one rule that is lexical, not automatic. A large set of words ends in p, ç, t, k and keeps it voiceless even before a vowel — you cannot predict every member from spelling, so you learn them per word. The strong heuristics: most monosyllabic native words and many loanwords do not soften. (Full catalogue: when consonants do NOT soften.)

Çocuklar parkta topu birbirine atıyorlar.

The kids are throwing the ball to each other in the park.

Hukuku herkesten çok seviyor, avukat olacak.

She loves law more than anyone — she's going to be a lawyer.

Top → topu (monosyllable, stays p, never tobu), hukuk → hukuku (Arabic loan, stays k). The hardening and devoicing rules (2, 3, 4) have no exceptions — they are fully automatic. Only softening is a fact you memorize word by word, which is why learning every noun with its accusative (kitap/kitabı, top/topu) is the single best habit.

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Three of the four rules are automatic; only softening is lexical. So your memory effort goes almost entirely into "does this word soften?" — and the cheapest way to record the answer is to learn the noun together with its accusative: kitap → kitabı (softens), top → topu (doesn't).

Common mistakes

❌ Kitapı rafa koy.

Incorrect — a vowel suffix softens a softening word: kitabı.

✅ Kitabı rafa koy.

Put the book on the shelf.

❌ Sınıfda kimse yok.

Incorrect — after voiceless f the locative D hardens to t: sınıfta.

✅ Sınıfta kimse yok.

There's no one in the classroom.

❌ Simitci nerede?

Incorrect — after voiceless t the agent suffix C hardens to ç: simitçi.

✅ Simitçi nerede?

Where's the simit-seller?

❌ Çocuk tobu duvara attı.

Over-applied — top is a monosyllable that does NOT soften: topu.

✅ Çocuk topu duvara attı.

The child threw the ball at the wall.

❌ Evte oturuyorum.

Wrong direction — ev ends in voiced v, so D stays: evde.

✅ Evde oturuyorum.

I live at home / in the house.

The thread running through every error is inconsistency — softening one word and not the next, or forgetting that the suffix reacts to the stem's final voicing. Run the system, not the rule: ask first "does the suffix start with a vowel (→ softening?) or a consonant (→ hardening?)," then "is the stem's last sound voiced or voiceless?" Two questions, and the spelling falls out.

Key takeaways

Voicing drives everything. The voiceless set is p, ç, t, k, s, ş, h, f (Fıstıkçı Şahap).
Rule 1 — Softening: stem-final p, ç, t, k → b, c, d, ğ/g before a vowel suffix. Lexical — many words don't.
Rule 2 — Hardening D→t: suffix D hardens after a voiceless stem (sınıfta, kitaptan). Automatic.
Rule 3 — Hardening C→ç: suffix C hardens after a voiceless stem (simitçi, kuşçuk). Automatic.
Rule 4 — Final devoicing: word-final b, c, d, g → p, ç, t, k in the citation form (kitab- → kitap). Automatic.
Only softening has exceptions (monosyllables, loans) — learn each noun with its accusative.

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