Ответ:

  1. That shop sells toys, but it doesn’t sell toys.
  2. Scott smokes a lot, but he doesn’t smoke before breakfast.
  3. We know Robert, but we don’t know his father.
  4. His father gives him money, but he doesn’t give him much.
  5. I make mistakes, but I don’t make grammar mistakes.
  6. He does homework every evening, but he doesn’t do much.
  7. English people eat a lot of potatoes, but they don’t eat much rice.
  8. My mother buys a lot of food every day, but she doesn’t buy much meat.
  9. We like fish, but we don’t like to eat it every day.
  10. Laura grows a lot of flowers in her garden, but she doesn’t grow roses.

В отрицательной форме в Present Simple используются don’t с I/you/we/they и doesn’t с he/she/it; после них глагол употребляется без окончания -s.