This is the 354th most frequent Turkish word.
süren
The Turkish word "süren" means "ongoing" or "continuing."
In this sentence, 'süren' refers to the action of lasting, used as a participle referring to the marathon.
Yarışta ilk olan araba beş saat süren bir maratonun sonunda kazandı.
The car that came first in the race won after a marathon lasting five hours.
In this sentence, 'süren' is used as an adjective describing the noun 'hastalık' (illness), indicating the prolonging nature of the illness.
Uzun süren hastalık sonunda iyileşti.
After a long-lasting illness, he finally recovered.
In this sentence, 'süren' is used to describe the duration of the lesson, functioning as an adjective modifying the noun 'ders' (lesson).