This is the 17113th most frequent Turkish word.
çocuktur
"Çocuktur" means "is a child" in English.
The word 'çocuktur' is part of the predicate and it refers to Ahmet being a child. The suffix '-tur' adds emphasis or expresses factual nature.
Ahmet oldukça sevimli bir çocuktur.
Ahmet is quite a cute child.
Here, 'çocuktur' highlights 'child' as the subject typically in such situations, along with the '-tur' suffix for factual emphasis.
Havalar soğuk olduğunda çocuktur genelde ilk hasta olan.
When the weather is cold, it is usually the child (who) gets sick first.
In this context, 'çocuktur' emphasizes the noun 'child' to justify or explain behavior, again using '-tur' for emphasis or general truth.