В задании просят Active Voice (активный залог) превратить в Passive Voice (страдательный залог).
1) A Christmas party is organised by the children.
2) Guard dogs are trained by my neighbour.
3) This game is played by people of all ages.
4) A lot of e-mails are sent every day by the secretary.
5) These test are corrected by two teachers.
6) The green cars are followed by a police car.