1)поставить во множественном числе. house, mouse, potato, piano, hish, baby, valley, knife,thief, foot, cliff, woman, tooth, child, box, ox, sheep. 2)образовать единственное число. heroes, kisses, ffies, donkeys, loaves, feet, deer, men-of-war, sisters-in-iaw. 3)выбрать одну из двух форм. the news (are /is) heard on the radio at nine o'clock. some people (are /is) coming today. hob 's trousers (are /is) torn. the furniture in the room (are /is) of good. quality. his information (are /is) not correct.