• By changing –y into –ies if a noun ends in a consonant before the -y.
• By adding –es to nouns ending in -o.

Singular	Plural
banjo	banjos/banjoes
archipelago	archipelagos/es
cargo	cargos/cargoes
desperado	desperados/desperadoes
halo	halos/haloes
lasso	lassos/lassoes
mango	mango/mangoes
memento	mementos/mementoes
motto	mottos/mottoes
tornado	tornados/tornadoes
volcano	volcanos/volcanoes
zero	zeros/zeroes

• By changing –y into –ies if a noun ends in a consonant before the -y.
• By adding –es to nouns ending in -o.