Singular and plural nouns

Singular and plural nouns. Write plural nouns for the provided singular nouns in English.
Singular Plural
1. cat
2. dog
3. house
4. potato
5. tomato
6. class
7. box
8. watch
9. bush
10. kilo
11. photo
12. piano
13. soprano
14. country
15. baby
16. fly
17. day
18. boy
19. leaf
20. loaf