Here is my explanaition.
Rule 1 : Last vowel counts.
Look at the last vowel to decide which suffix to add.
If the last vowel is a sharp vowel than the suffix should have a sharp vowel.
If the last vowel is a deep vowel than the suffix should have a deep vowel.
Sharp vowels: e,i,ö,ü
Deep vowels: a,ı,o,u
This rule is enough to determine which suffix to use when there are only two forms of the given suffix.
Example 1:
The plural suffix in Turkish has only two forms. These are -lar and -ler. -ler is for words which have a sharp vowel as the last vowel and -lar is for words which have a deep vowel as the last vowel.
Exercise:
okul > last vowel is "u" and "u" is a deep vowel so it takes the suffix with the deep vowel which is -lar: okullar
sinema > last vowel is "a" and "a" is a deep vowel so it takes the suffix with the deep vowel which is -lar: sinemalar
kalem > last vowel is "e" and "e" is a sharp vowel so it takes the suffix with the sharp vowel which is -ler: kalemler
Example 2: The infinitive suffix has only two forms, -mak and -mek.
Sharp vowels: e,i,ö,ü > obviously if the last vowel of the verb stem is one of these than you use -mek.
Deep vowels: a,ı,o,u > -mak
git+mek
oku+mak
Example 3: Future tense has only two forms: -ecek -acak.
-ecek is for words which have a sharp vowel as the last vowel and -acak is for words which have a deep vowel as the last vowel.
Exercise:
infinitive: gelmek
verb stem: gel (drop the -mek or -mak to get the verb stem)
gel > last vowel is "e" and we have -ecek or -acak. Which one should I use? Of course sharp vowels match with sharp vowels and vice versa so we use -ecek > gelecek
So far it was easy. If the last vowel is a deep vowel use the deep suffix and vice versa.
Rule 2:
Some suffixes have 4 forms. If these 4 forms have the vowels ı,i,u,ü then follow this table:
If the last vowel is "a" or "ı" > use "ı"
If the last vowel is "e" or "i" > use "i"
If the last vowel is "o" or "u" > use "u"
If the last vowel is "ö" or "ü" > use "ü"
Example:
Simple past tense has the following forms:
-dı
-di
-du
-dü
Exercise:
Okumak > Oku > last vowel is "u" and takes "u" according the tabe above > okudu
dinlemek > dinle > last vowel is e and takes "i" > dinledi
With these two rules we have covered most of the topic.
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