1. a dress – two dresses
2. a lady – two ladies
3. a baby – three babies
4. a story – three stories
5. a fox – four foxes
6. a leaf – four leaves
7. a thief – five thieves
8. a wolf – five wolves
9. a loaf – six loaves
10. a city – six cities
11. a sheep – seven sheep
12. a policeman – seven policemen
13. a sportsman – eight sportsmen
14. a bench — eight benches
15. a witch – nine witches
16. a tomato – nine tomatoes
17. a potato – ten potatoes
18. a photo – ten photos