помогите просклонять 3 предложения на английском по временам :(((

из Present Simple в:
>Present Continious,
>Past Simple,
>Past Continuous,
>Past Rerfect.

предложения:
1) This book is read by millions of children all over the world.
2) I go to the gym twice a week.
3) We don’t know what to tell the teacher.