The plurals of words ending in -o are formed by either adding -s or by adding -es. The plurals of many words can be formed either way. To determine whether a particular word ends in -s or -es (or if the word can be spelled either way), check your the list below and if you have to check your dictionary. There are two helpful rules: a. All words that end in a vowel plus -o (-ao, -eo, -io, -oo, -uo) have plurals that end in just -s: - stereo--stereos
- studio--studios
- duo--duos
b. All musical terms ending in -o have plurals ending in just -s. - piano--pianos
- cello--cellos (I have been told that the plural for cello is actually, celli)
- solo--solos
c. Plural forms of words ending in -o: -os | -oes | -os or -oes | autos infernos kimonos logos maraschinos ponchos sombreros tacos torsos tobaccos typos | echoes embargoes heroes Negroes potatoes tomatoes torpedoes vetoes | |
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