Ответ:

  1. I’m not taking a shower.
  2. The weather is not changing this week.
  3. Our sportsmen are not going to Canada tomorrow.
  4. Yaroslav is not changing all the time.
  5. Water is not getting colder every day.
  6. My friend is not doing his work now.
  7. My dad is not washing his car now.
  8. The sea is not getting dirty.
  9. The sun is not shining.
  10. She is not writing a poem for her mother’s birthday.

В отрицательной форме Present Continuous частица not ставится после формы глагола to be.