For a substance (actor -um- & patient) to become soft, of cooked food, lūtu; ripe sweet potatoes, opit; ripe fruit, ulum 1; skin of an old person; cement before it sets; uncaked soil.
Awnid ma'pit nan lapnay at umuyammi ya maphod hi onon.
Wait until the sweet potato is ripened and then it will become soft and will be good to eat.