помогите с английским с пассивными глаголами(Ответы там неправильные написаны,вообще эту тему не понимаю:(Заранее спасибо большое

1. will be published2. was the telephone invented3. will be posted4. Has your composotion been written5. has been played6. must be answered7. was being painted8. are being discussed9. have been found10. could be seen11. is used12. had been done