They have not read the book. The book had not been read by them The book was not read by them The book has not been read by them The book is not being read by them Read Notes
I have opened the present. The present has been opened by me The present had been opened by me The present was being opened by me The present is being opened by me Read Notes
I have eaten a burger. A burger has been eaten by me A burger had been eaten by me A burger was being eaten by me A burger is being eaten by me Read Notes
Kamran has paid the bill. The bill had been paid by Kamran The bill has been paid by Kamran The bill was being paid by Kamran The bill is being paid by Kamran Read Notes