Ед.ч: desk, room, school, ship, clock, girl, horse, house, winter, city, pen, book, day, teacher, ball, stone, water, wool, letter, box. Мн.ч: tomatoes, cities, matches, shoes, skies, days, heroes, classes, roofs, armies, cheifs, cats, books, boys, guns, cargoes, lives, bushes, foxes, knives