For example:
datum---data
criterion---criteria
genus---genera
larva---larvae=
crisis---crises
matrix---matrices
focus---foci
monsieur---messieurs
13. A few allow either a regular plural or the plural retained
from the foreign language:
formula---formulae or formulas
beau---beaux or beaus
index---indices or indexes
stratum---strata or stratums
bandit---banditti or bandits
cherub---cherubim or cherubs
seraph---seraphim or seraphs
14. In very loose compounds in which a noun is followed by an adjective
or the like, the noun commonly takes the plural ending, as in
_courts-martial, sons-in-law, cousins-german_. When the adjective is
more closely joined, the plural ending must be placed at the end of the
entire word. Thus we have _cupfuls, handfuls,_ etc.
Different Spellings for the same Sound.
Perhaps the greatest difficulty in spelling English words arises from
the fact that words and syllables pronounced alike are often spelled
differently, and there is no rule to guide us in distinguishing.
In order to fix their spelling, in mind we should know what classes of
words are doubtful, and when we come to them constantly refer to the
dictionary.
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