질문이요~~

It was impossible for me to distinguish among my pain and difficulty in breathing , the flapping of the window curtain, and certain as yet unresolved parts oh the potential problem on which I was working.

certain 앞에 and 있잖아요 and는 어디랑 어디랑 연결되어 있는건가요?

제가 이해안가는 건 해설지에는 certain이 확신하다라고 되어있는데 그럴때는 형용사 일때 그 뜻으로 해석되는건데 앞에 형용사 impossible이랑 연결되는건 아닌거 같고ㅠㅠ 부탁드려요쌤~~ ━━━━━━━━━━━━━━━━━━━━