Merhaba!

I was just wonderiıng, is there a special rule or any easy way to know when 'k' changes to a 'ğ'?

For example in words like:

yürek -> yüreğimle
öpücük -> öpücüğü

Teşekkür!

Actually that's a pretty consistent rule, you change k to ğ when you add a suffix starting with vowel to a word ending in k, the exception is when the word is a 1-sylable word, in which case the k doesn't change except for a few exeptions like gök (sky), or renk (color), renk is more irregular since there k becomes g because nğ is impossible in Turkish.

Check this out
Admin lessons
You will find more about it,just check 'Learn Turkish' at the left side.

Thanks you two