Write the plural form of the following. a regular nouns: story, play, glass, flag, photo, name, match, knife, bush, chief, page, radio, roof, prize, set, key, factory, wolf, piano, class, cup, city

Stories, plays, glasses, flags, photos, names, matches, knives, bushes, chiefs, pages, radios, roofs, prizes, sets, keys, factories, wolves, pianos, classes, cups, cities.