Ответ:

  1. I clean my teeth every day.
  2. You clean your teeth.
  3. Nick cleans his teeth.
  4. My brother does his homework in the evening.
  5. Pete and Jack clean their shoes in the morning.
  6. My parents and I live in our house in the country.
  7. This is a puppy. Its tail is long.
  8. My grandparents live in their flat.

Притяжательные местоимения переводятся так: my — мой, your — твой/ваш, his — его, their — их, our — наш, its — его/её для животного или предмета.