Читать книгу The Grammar of English Grammars - Goold Brown - Страница 235

Numbers, in grammar, are modifications that distinguish unity and plurality.

There are two numbers; the singular and the plural.

The singular number is that which denotes but one; as, "The boy learns."

The plural number is that which denotes more than one; as, "The boys learn."

The plural number of nouns is regularly formed by adding s or es to the singular: as, book, books; box, boxes; sofa, sofas; hero, heroes.

When the singular ends in a sound which will unite with that of s, the plural is generally formed by adding s only, and the number of syllables is not increased: as, pen, pens; grape, grapes.

But when the sound of s cannot be united with that of the primitive word, the regular plural adds s to final e, and es to other terminations, and forms a separate syllable: as, page, pages; fox, foxes.