Igikorwa co guhindura c’igice c’umubiri c’umubiri gifise kabiri- giterwa n’inkomoko y’umuyaga, harimwo n’ugutuma umwuka ugenda, n’aho biguma mu kibanza;
Igikoresho kimwe - igikorwa co guhindura ni igikorwa gifunguye gifatwa n’umuyaga, kandi igikorwa co hafi ni ukugaruka kw’impeshi: Uburyo bumwe - Gukora: ubwoko busanzwe bufunguye(N/O) n’ubwoko busanzwe bufunze(N/C). Ubwoko bwuguruye mu bisanzwe: umwuka uzima, ufungure; Ubwoko bwafunzwe mu bisanzwe: bufunguye, bupfutse.
