Ответ:
1. Add -s: helmet, toy, handbag, guitar, boy, cap
2. Add -es: watch, box, bus, hero
3. Change y → ies: baby, lady
4. Change f/fe → ves: scarf, knife
5. Irregular plurals: child
Ответ: helmet, toy, handbag, guitar, boy, cap; watches, boxes, buses, heroes; babies, ladies; scarves, knives; children.
