Page 501

501.1 Compound Nouns

The plurals of some compound noun are formed by adding s or es to the main word in the compound.

brothers-in-law  maids of honor  secretaries of state

501.2 Irregular Spelling

Some words (including many foreign words) form a plural by taking on an irregular spelling; others are now acceptable with the commonly used s or es ending.

child — children

goose — geese

cactus — cacti or cactuses

501.3 Adding an s

The plurals of symbols, letters, numbers, and words discussed as words are formed by adding an apostrophe and an s.

#’s, &’s, $’s, +’s, =’s