Numbers and Regular/Irregular Plurals:

1. a fish - fishes (regular)
2. a sandwich - sandwiches (regular)
3. a lady - ladies (irregular)
4. a laptop - laptops (regular)
5. a pencil - pencils (regular)
6. a team - teams (regular)
7. a story - stories (regular)
8. a bay - bays (regular)
9. a match - matches (regular)
10. a camera - cameras (regular)
11. a box - boxes (regular)
12. a foot - feet (irregular)
13. a goose - geese (irregular)
14. a baby - babies (regular)
15. a fox - foxes (irregular)
16. a key - keys (regular)
17. a tooth - teeth (irregular)
18. a life - lives (irregular)
19. a shelf - shelves (regular)
20. an hour - hours (irregular)