Yokluğumda , geldiğimde etc.

Could someone kindly explain the grammar rule as demonstrated above. The first example I understand in my absence , the breakdown being yoklum, and the second when I came. Howver, I don´t quite understand the application of the soft "ğ".

Thank you very much

It´a character of our alphabet.

An example; tree means ´´ ağaç ´´ in Turkish. If we said ´´ agac ´´ it would be so rude. 

So that explains why we need to use it ^-^

Yok + luk + um + da ----> in my absence

 Yokluğumda

gel + dik + im + de ---> when I came

geldiğimde

´ This is what we call ´´ Consonant softening in turkish´´ .. (türkçede ünsüz yumuşaması.

* Softening of the hard consonants is a grammer rule in Turkish.

* If a word that finishes with a consonant (p,ç,t,k) takes a suffix starting with a vowel, those hard consonants softens to  (b,c,d,ğ or g)

 * yokluk + umda --->  so here  k turn into ğ  according to rule.

   yokluğumda

  *

  *kitap+ı = kitabı

  * ağaç+ı = ağacı

  * inat+ı=inadı

   There are exceptions of course like in every rule in turkish

  * This rule does not apply to proper nouns like names

      [ Ahmeti gördüm]

   * if the ´´t´´ at the end of the word is a part of the suffix itself,it does not softens

      [konut+u =konutu,yakıt+ın =yakıtın,yazıt+ın=yazıtın]

Tunci thank you