Измените предложения из активного залога в пассивный.
1) Robert told me this very strange story
2) The virus may infect millions of computers
3) They are going to send new subscribers an email
4) Our TV hasn't been working properly for days
5) They had offered me a job as a foreign correspondent
6) Many people think that mobile phones are bad for your health

Robert told me this very strange story
→ I was told this very strange story by Robert.
(Либо также возможно: This very strange story was told to me by Robert.)

The virus may infect millions of computers
→ Millions of computers may be infected by the virus.
(Глагол «infect» в пассиве превращается в «be infected».)

They are going to send new subscribers an email
→ New subscribers are going to be sent an email.
(Также допустимо: An email is going to be sent to new subscribers.)

Our TV hasn't been working properly for days
→ Здесь пассивная конструкция невозможна, потому что в предложении нет прямого дополнения, которое можно было бы сделать подлежащим в пассиве.
По сути, это предложение уже описывает состояние объекта.

They had offered me a job as a foreign correspondent
→ I had been offered a job as a foreign correspondent.
(Активное дополнение «me» становится подлежащим в пассиве.)

Many people think that mobile phones are bad for your health
→ Mobile phones are thought by many people to be bad for your health.
(Также возможно: That mobile phones are bad for your health is thought by many people.)