Образуйте форму множественного числа нижеприведенных существительных. Month, horse, flower, potato, book, plan, bridge, match, nose, bus, box, army, carrot, watch, onion, shop, address, day, fly, hotel, lady, key, gate, clock, office, city. Shelf, calf, grief, cliff, life, knife, proof, reef, sheaf, wife, safe, gulf, self, elf, leaf, loaf, wolf, chief. Phenomenon, crisis, index, antenna, formula, datum, nucleus, criterion, analysis, basis, appendix, tableau, radius, hypothesis Boy-messenger, sister-in-law, text-book, pocket-knife, statesman, fellow-worker, merry-go-round, man-servant, hotel-keeper, forget-me-not, lady-bird, woman-doctor, passer-by, commander-in-chief.