Learn Turkish: Sonuçları yarın ilan edecekler. - They will announce the results tomorrow.

Consonant mutation (like ç softening to c) happens when a suffix starting with a vowel is attached directly to the word. Here, the plural suffix -lar is attached first. Since -lar starts with a consonant, sonuç remains unchanged. If they were announcing a single result, the vowel would attach directly and it would mutate: sonucu (the result).

Why does sonuçları end in -ı?

This is the accusative case marker. It marks "the results" as the specific direct object of the verb ilan etmek. Because we are talking about specific, known results (translating to "the results"), the accusative case is required.

Why does the verb edecekler start with a d?

The verb here is ilan etmek, a compound verb meaning "to announce" (literally "to make an announcement"). When the vowel-initial future tense suffix -ecek attaches to the helper verb etmek, the t softens to a d (et + ecek = edecek). Finally, the plural suffix -ler is added for "they".

Does the placement of yarın change the meaning of the sentence?