Write the plural form of the following

   boats      boys      cats      clocks      dogs      ducks      holidays      parks      plants      plots      plums      seeds      sisters      socks      trees   
1. boy =

2. cat =

3. duck =

4. sock =

5. clock =

6. boat =

7. park =

8. dog =

9. plant =

10. tree =

11. sister =

12. holiday =

13. plot =

14. plum =

15. seed =