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14. Possessive forms of compound nouns form their plural by adding s :
Examples: singular plural
sister-in-law ’s sisters-in-law ’s
editor-in-chief’s editors-in-chief’s
mother-in-law ’s mothers-in-law’s
15. Plurals of proper nouns are formed by adding s unless the noun ends in s, in
which case add es :
Examples: singular plural
Hall Halls
Smith Smiths
Jones Joneses
16. Possessive forms of nouns follow rule 15 above, with the exception – the
singular possessive of a name ending in es may either keep or drop the second s ;
the plural possessive of such nouns add s:
Examples: singular plural
Hall’s Halls’
Smith’s Smiths’
Jones’s or Jones’ Joneses’
17. Adjectives ending with ful or al become adverbs merely by adding l y :
Examples: cheerful and cheerfully
wonderful and wonderfully
normal and normally
18. Words ending in ll often drop one l when adding a prefix:
Examples: fill and fulfil roll and enrol
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