Pronunciation: [sˈe͡ɪ pˈasɪŋ] (IPA)
Correct spelling for the English word "say passing" is [sˈe͡ɪ pˈasɪŋ], [sˈeɪ pˈasɪŋ], [s_ˈeɪ p_ˈa_s_ɪ_ŋ] (IPA phonetic alphabet).