1) A new system of work is being started by the librarians. - Новая система работы внедряется библиотекарями. - The librarians are starting a new system of work.
2) He doesn't like to be laughed at. - Ему не нравится, когда над ним смеются. -
He doesn't like when his classmates laugh at him.
3) The doctor must be sent for at once. - Нужно сразу послать за врачом. - You must send for the doctor at once.
4) The door must be kept shut. - Дверь должна оставаться закрытой. - The janitor must keep the door shut.
5) The talk must have been started by our opponents. - Разговор, должно быть, был начат нашими оппонентами. - Our opponents must have started the talk.
6) The problem is being discussed now. - Проблема сейчас обсуждается. - The parents are discussing the problem now.