Ответ:

  1. My classmates often play hide-and-seek.
  2. I never drink coffee with milk.
  3. Her parents usually go to the theatre.
  4. Pupils always read and write at the lessons.
  5. I seldom call my cousin.
  6. My elder sister sometimes cooks dinner.
  7. He always drinks coffee in the morning.
  8. Nick usually reads books in English.
  9. My parents often buy me nice toys.

Наречия частотности обычно ставятся перед смысловым глаголом, но после глагола to be.