11. Образуйте множественное число от следующих существительных.
1)bags, dogs, birds, verbs, spoons, rooms, rings, things, apples, songs .
2)trees, pies , ladies, teachers, letters, plays, cities, toys, berries, tables.
3)cakes, forks, maps, lamps, hats, clocks, coats, skirts, plants.
4)shelves, leaves, knives.
5)buses, classes, dresses, pieces, horses, houses, foxes, matches,
6)benches, brushes, bridges, cottages, buses, noses, roses, blouses.