Rules and usage
Vowel harmony is one of the most fundamental rules in Turkish grammar. Almost every suffix you add to a word will change its vowels to match the vowels already in that word. This is called ünlü uyumu, and once you understand the pattern, you will recognize it everywhere.
What Is Vowel Harmony
Turkish vowels follow strict harmony rules. When you add a suffix to a word, the vowels in the suffix must "agree" or "harmonize" with the vowels in the root word. This means the same suffix takes different forms depending on what vowels are in the word it attaches to. Example: The suffix -da means in or at. In Ankara'da (in Ankara), it appears as -da because Ankara contains back vowels. In İstanbul'da (in Istanbul), it appears as -da because Istanbul contains back vowels. But in Ege'de (in the Aegean), it becomes -de because Ege contains front vowels.
✅ Positive sentence examples
| Turkish | English |
|---|
| Masada kitap var. | There is a book on the table. |
| Kitabı okuyorum. | I am reading the book. |
⛔ Negative sentence examples
| Turkish | English |
|---|
| Masada kitap yok. | There is no book on the table. |
| Kitabı okumuyorum. | I am not reading the book. |
❓ Question sentence examples
| Turkish | English |
|---|
| Masada kitap var mı? | Is there a book on the table? |
| Kitabı okuyor musun? | Are you reading the book? |