singular and plural

1. A man and a woman went to the market.
2. Men and women went to the market.
3. That man has only one foot.
4. All men have two feet.
5. One woman can tell the story to many women.
6. I lost my one tooth.
7. My grand father has lost all his teeth.
8. The goose swims in the pond.
9. I see the geese   in the pond.