nominal sentences (جُمْلَة اِسْمِيَّة) and from noun-adjective phrases (اسْمٌ وَصِفَّة) by the case ending of the muḍāf ilayhi as well as the definiteness...

or /a/ then the suffix (-ya) is used as in أبو /abu/ ('father') becomes أبويَ /abuːja/ ('my father') but if it ends with an /i/ then the suffix (-yya)...