Read Collins Cobuild English Grammar Online
Authors: Collins
Collins Cobuild English Grammar (187 page)
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R18
With some nouns ending in
a
, the plurals are formed by adding
e
.
| larva |  | larvae |
| vertebra | | vertebrae |
Some, such as
antenna
,
formula
,
amoeba
, and
nebula
, also have less formal plurals ending in
s
.
R19
Other nouns form their plurals in other ways. Some of these have two plural forms, one formed with
s
and one formed in a different way. Usually the form with
s
is used in less formal English.
| appendix | | appendices or appendixes |
| automaton | | automata or automatons |
| corpus | | corpora or corpuses |
| criterion | | criteria |
| genus | | genera |
| index | | indices or indexes |
| matrix | | matrices |
| phenomenon | | phenomena |
| tempo | | tempi or tempos |
| virtuoso | | virtuosi or virtuosos |
| vortex | | vortices |
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