Вpassive voise. please, help me. 11. the briefing is in full swing. the correspondents are interviewing the participants of the conference. 12. the company was developing a new project. 13. you can't watch the film now. the mechanic is fixing the tv set

11. The briefing is in full swing. The participants of the conference  are being interviewied  by the correspondents .
12. A new project was being developed by the company
13. You can't watch the film now. The TV set is being fixed by the mechanic