For example, the matter of a house is the bricks, stones, timbers, etc., or whatever constitutes the potential house, while the form of the substance is the actual house, namely 'covering for bodies and chattels' or any other differentia that let us define something as a house.
fɔːɹ ɛɡzˈæmpəl, ðə mˈæɾɚɹ əvə hˈaʊs ɪz ðə bɹˈɪks, stˈoʊnz, tˈɪmbɚz, ɛtsˈɛtɹə., ɔːɹ wʌtˈɛvɚ kˈɑːnstɪtˌuːts ðə pətˈɛnʃəl hˈaʊs, wˌaɪl ðə fˈɔːɹm ʌvðə sˈʌbstəns ɪz ðɪ ˈæktʃuːəl hˈaʊs, nˈeɪmli kˈʌvɚɹɪŋ fɔːɹ bˈɑːdiz ænd tʃˈæɾəlz ɔːɹ ˌɛni ˈʌðɚ dˌɪfɚɹˈɛnʃə ðæt lˈɛt ˌʌs dᵻfˈaɪn sˈʌmθɪŋ æz ɐ hˈaʊs.