Мне нужно перевести предложения потом их перевести из пассивного залога в активный, добавить действующие лицо в предложения, но сохранить время. 1) a new system of work is being started by the librarians 2) he doesn't like to be laughted at. 3) the doctor must be sent for at once. 4) the doctor must be kept shut. 5) the is talk must have been started by our opponents. 6) the problem is being discussed now.

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.