English special singular to plural Homomorphism of simple and complex numbers Plural noun to plural

English special singular to plural Homomorphism of simple and complex numbers Plural noun to plural

1) For singular nouns, add s: students, apples, bags, trees, books, brothers. 2) for nouns ending with s, x, SH, CH, add es: glasses, boxes, brushes, matches. 3) for nouns ending with consonant letter and y, change y to I, add es: Cities, babies, enemies. 4) for nouns ending with f or Fe, change y to I, add es: cities, babies, enemies