4, 5. _Other verbal substantives_, signifying instruments, are made
from the future active: thus, the verb métecan, I chop, having métetze
in the future, receives siven in lieu of the final syllable, and makes
the substantive, métesiven, axe or tool with which to chop. Many of
these words likewise terminate in rina, as bícusirina, flute, from
bícudan, I whistle, and bíhirina, shovel, from bihán, I scrape.