2.
2 babies
3 children
4 green leaves
5 old ladies
6 radios
7 oxen
8 tall women
9 knites
10 toys
11 policemen
12 raspberries
13 sandwiches
14 mice
15 photos
16 cliffs
17 pens
18 watches
19 big feet
20 nice books
3.
2 ostriches
3 parrots
4 swans
5 turkeys
6 dolphins
7 giraffes
8 deer
9 calves
10 foxes
11 mice
12 hippos
4.
- s: houses, apples, balls, radios, cliffs giraffes, parrots, boys, melons, armchairs.
-es: buses, glasses, boxes, tomatoes, dresses, torches, foxes, watches, dishes.
-ies: cherries, babies, ferries, cities, ladies.
-ves: knives, leaves, wives, calves, wolves.
Irregular : men, children, teeth, geese, oxen, women, sheep.