Türkçe öğrenmiyorum, çünkü birkaç gün hastaydım.  I didn´t study Turkish for a few days, because I was sick.

Thank you 

Let me write English and Turkish meanings of the sentences above. You will see what has happened up there.

Türkçe öğrenmiyorum: I am not studying(learning) Turkish.

çünkü birkaç gün hastaydım: because I was sick for a few days.

I didn´t study Turkish for a few days: Birkaç gün Türkçe çalışmadım

because I was sick: Çünkü hastaydım.

Faruk thank you very much.