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English Grammar and Composition for Public Schools

George Armstrong

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Book Excerpt: 
. . . valley, valleys.

Nouns ending in y preceded by a consonant, form the plural by changing the y into i and adding es; as, lily, lilies; copy, copies.

4. Some nouns ending in f or fe form the plural by changing f or fe to v and adding es; as, knife, knives.

Note the following:—wife, life, wolf, loaf, half, leaf, thief, shelf, calf, self.

5. A few nouns form the plural by adding en to the singular form; as, ox, oxen; child, children; brother, brethren.

6. Some nouns form the plural by changing the vowel of the singular; as, man, men; goose, geese.

7. Most nouns taken from foreign languages retain their foreign plurals:

   Singular.Plural.     radius,radii.. . . Read More