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Questions & Answers about Aynı hatayı tekrar etme.
Why is tekrar etme written as two separate words here, when we write things like kaybetmek as one word?
Auxiliary verbs like etmek combine with nouns to make new verbs. When the noun doesn't change its spelling (no vowels are dropped and no consonants are doubled), the words stay separate. Since tekrar doesn't change when combined with etmek, it is written as two words. Words only merge if a vowel drops (like kayıp to kaybetmek) or a consonant doubles (like his to hissetmek).
Why does hata take the accusative case ending to become hatayı?
The accusative case marks a definite direct object. Because the sentence specifies the same mistake (aynı hatayı) rather than just a mistake, the object is specific and requires the accusative suffix -ı. The buffer letter y is added to prevent the two vowels from colliding.
Could I use the verb tekrarlamak instead of the auxiliary compound tekrar etmek?
Yes! Tekrar etmek and tekrarlamak are basically interchangeable when meaning to repeat. You could easily rephrase this sentence as Aynı hatayı tekrarlama without changing the meaning.