Помогите изменить ед.число. на множественное

1 This is a balloon

2 it is a baby

3 She is a woman

4 This is a mouse

5 He is a man

6 That is a wolf

7 He is a policeman

8 That  is a goose

9 This is a foot

10 There is a sheep

11 This is a tooth

12 it is a deer