помогите просклонять 3 предложения на британском по временам :(((из Present Simple

1 this book is being read ..
This book was read ..
This book was being read..
This book had been read ..
2 i am going to the gym now
i went to the gym twice a week
I was going to the gym this time yesterday
I had gone to the gym before you came

3 we don't know what we are telling the teacher now
We didn't know what to tell the teacher
We didn't know what we were telling the teacher
We didn't know what we had told the teacher