Образуйте форму множественного числа следующих существительных: frog, party, roof, wife, driver, play, tomato, speed, box, paper, student, baby friend, bench, knowledge, tooth, lady, deer, life, bus, sea, mouse, coffee, story, woman, hour, gold, tea, foot, street, mother.

Frogs, parties, roof, wives, drivers, plays, tomatoes, speeds, boxes, papers (если в смысле научная статься, если в смысле бумага, то окончание не добавляется), 
students, babies, friends, benches, knowledge, teeth, ladies, deer, lives, buses, 
seas, mice, coffee, stories, women, hours, gold, tea, feet, streets, mothers.