Ettirgen çatı (causative)
Turkish wraps 'make / let / have someone do it' inside the verb. yemek = to eat → yedirmek = to feed (make eat). uyumak = to sleep → uyutmak = to put to sleep. ölmek = to die → öldürmek = to kill (make die). The trick is that the suffix has several shapes: -dir / -tir is the workhorse, -t attaches to longer stems ending in a vowel or -l / -r, and a small group uses an old -ir / -it / -ert.
Why bother?
English uses 'make him do it' or a separate verb ('feed' for 'make eat'). Turkish builds it into the verb, then keeps stacking endings: yedirtmek = to have someone feed someone — double causative. The original subject of the action becomes a direct object (accusative); the new causer takes the verb.
The default suffix: -dir / -tir
Most verbs of two or more syllables, or stems ending in a non-vowel non-l/r consonant, take -dir / -dır / -dur / -dür (after voiced sounds) or -tir / -tır / -tur / -tür (after voiceless): bil- → bildirmek (to inform = make know), piş- → pişirmek (to cook = make cook), gül- → güldürmek (to make laugh).
The short -t after vowels and -l / -r
Multi-syllable stems ending in a vowel, or in -l / -r, take just -t: uyu- → uyutmak (to put to sleep), anla- → anlatmak (to explain = make understand), otur- → oturtmak (to seat = make sit), temizle- → temizletmek (to have something cleaned).
The old -ir / -it / -ert pocket
A small closed list keeps an older causative. iç- → içirmek (to make drink), bat- → batırmak (to dunk = make sink), yat- → yatırmak (to lay down). And three irregulars with -ert: çıkmak → çıkarmak (to take out — actually -ar), gitmek → gidermek (to remove). Don't memorize the whole list — just notice it when it shows up.
Stacking and case
Causatives stack: yap- → yaptır- (have done) → yaptırt- (have someone have it done). The person who actually does the action goes in the dative (-e / -a), the thing affected stays accusative: Çocuğa kitabı okuttum. = 'I had the child read the book.' (lit. 'to-the-child the-book I-read-caused').
