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Questions & Answers about Bugünkü olay ilginçti.
The lesson says the suffix is -ki, so why is it -kü in bugünkü?
The suffix -ki is special because it usually ignores vowel harmony (for example, we say yarınki, not yarınkı). However, there are three common time words where it does change to match rounded vowels: bugün (today) becomes bugünkü, dün (yesterday) becomes dünkü, and gün (day) becomes günkü.
Why do we use -kü here instead of the possessive suffix, like bugünün olayı for 'today's event'?
In English, we use an apostrophe 's' for both ownership (the girl's book) and time (today's event). In Turkish, to turn a time word into a description of a noun, you use -ki. You will almost always use this pattern for things like tomorrow's exam (yarınki sınav) or today's news (bugünkü haberler), rather than possessive suffixes.
Why is the ending on the last word -ti instead of -di?
The base word is ilginç (interesting). Since it ends in the hard (voiceless) consonant ç, the past tense suffix -di (meaning 'was') changes its d to a t to match. This rule makes words easier to pronounce, giving us ilginçti.