Is -ial can be the Morphophonemic changes suffix -al ?? Hi, I'm Chris, I'm a student of english department and I have problem about linguistic, specially, about morphophonemic changes. My lecture gives the student a project to analyze about affix, morpheme and its morphophonemic changes. I want to analyze the suffix -al. For example: Potent (Adjective): /ˈpəʊ.t ə nt/ à Potential (adjective): /pə ʊ  ˈten. t  ʃ ə l/ Confident (adjective): /ˈkɒn.fɪ.d ə nt/ à Confidential (adjective): /ˌkɒn.fɪˈden. t  ʃ ə l/ Office (noun): /ˈɒf.ɪs/ à Official (adjective): /əˈfɪʃ. ə l/ (stress changing) Accident (noun): /ˈæk.sɪ.d ə nt/ à Accidental (adjective): /ˌæk.sɪˈden.t ə l/ (stress changing) Regiment (noun): /ˈredʒ.ɪ.mənt/ à Regimental (adjective): /ˌredʒ.ɪˈmen.t ə l/ (stress changing) Deny (verb): /dɪˈnaɪ/ à Denial (noun): /dɪˈnaɪ.əl/ If you can see from the example that I found, like in words potent becomes potential, regiment becomes regimental, they have same final sounds, which is /nt/ but what make me confuse is the sound of -al in potential and regiment. Why in 'potential' there is -ial and the final sound become /t  ʃ ə l/ but in regiment, it has no -i (-ial) and the final sound is same like the others. I had try to analyze but I'm still confuse. From my opinion, -ial is allomorph of -al, but they have different rules about the sounds. Please help me. Thank you.