As we learned before the vowels in Turkish are groupped as
front and back vowels. To understand the vowel harmony we need to also group them as Straight and
Round vowels. Round vowels are produced by rounding our lips, and the others are Straight vowels.
Back vowels - a, ı, o, u
Front Vowels - e, i, ö, ü
Straight vowels - a, e, ı, i
Round vowels - o, ö, u, ü
Verbs, nouns, adjectives etc. in Turkish always take some suffixes, therefore
it's important to know that the last vowel in the suffix(es) obeys some rules to match with the vowel in the word.
Actually, this is what we call Vowel Harmony. There two major and two minor Vowel Harmony rules:
Major vowel harmony 1: Back Vowels - if the last vowel of the word is a Back Vowel e.g.
a, ı, o, u the following sufix must be also a Back Vowel e.g. a, ı, o, u
Examples: araba (car) -> araba-sı (someone's car); balta (axe) -> balta-lar (axes)
Major vowel harmony 2: Front Vowels - if the last vowel of the word is a Front Vowel e.g.
e, i, ö, ü the following sufix must be also a Back Vowel e.g. e, i, ö, ü
Examples: ev (house) -> ev-i (someone's house); kedi (cat) -> kedi-ler (cats)
Minor vowel harmony 1: Straight Vowels - if the last vowel of the word is a Straight Vowel e.g.
a, e, ı, i the following sufix must be also a Straight Vowel e.g. a, e, ı, i
Examples: kına (henna) -> kına-sı (someone's henna); kirpi (hedgehog) -> kirpi-ler (hedgehogs)
Minor vowel harmony 2: Round Vowels - if the last vowel of the word is a Round Vowel e.g.
o, ö, u, ü the following sufix CAN ONLY BE a, e, u, ü
Examples: göl (lake) -> göl-ü (someone's lake); telefon (telephone) -> telefon-lar (telephones)