For something (patient ma-) to be extensive, as a landslide scar that becomes larger by running water, one's work, one's days for doing something.
Nadoldol nan goday hi payaw ti inumway danum hinan goday.
The landslide scar in the pond field was extensive because water passed along the landslide scar.
For someone (agent) to extend something (theme i-), as one's work, one's time for doing something.
Idoldolmu nan umāam ti nen un ītang han ūmam.
Extend that which you are making into an upland field because you see your upland field is small.