Merhaba

I have a question here. When/what condition should i use -iyor?

Thanks

çok teşekkür ederim 

edited : i know it now

This is for he/she/it in the present continous tense (-ing in English). But it is often used as an equivalent to the present tense in English. Here is a link:

http://www.turkishlanguage.co.uk/presten.htm