Learn Turkish: Başrolü ezberleyen kim? - Who is the one memorizing the lead role?

This is the focus of your current lesson! When the noun being described by the -An participle is obvious (like a generic person), you can drop it entirely. Here, the word ezberleyen becomes a noun itself, meaning "the one who memorizes."

Why does başrol have the -ü suffix?

The suffix -ü is the accusative case, which marks a specific direct object. Even though ezberleyen acts like a noun in this sentence, it is still built from the verb ezberlemek (to memorize) and can take objects just like a verb does. Because someone is memorizing a specific lead role, başrol takes the accusative case.

Why is there a -y- in ezberleyen?

The verb root is ezberle- (to memorize), which ends in a vowel. The relative clause suffix we are adding is -en. To prevent two vowels from clashing, Turkish requires the buffer letter -y- between them, resulting in ezberleyen.

Why does the question word kim (who) come at the very end of the sentence?