Задание выполняется по принципу "найди agent и object и поменяй их местами". тут главное просто их увидеть. и не забывать менять временные конструкции.
1. My mother washed all the dishes last night.
(mother - agent(т.е. тот, кто/что совершает действие), all the dishes - object(над кем/чем его совершают). were washed - это Past Simple. значит, в active мы должны употребить глагол wash именно в этом времени)
2. Some factories produce nice clothes in Turkey.
(some factories теперь agent, nice clothes - object, are produced - Present Simple)
3. A group of boys saw the suspects near the bus.
(a group of boys - agent, the suspects - object. were seen - Past Simple)
4. The maid cleans the house every Saturday.
(the maid - agent, the house - object. is cleaned - Present Simple)
5. The hurricane demolished the house last night.
(the hurricane - agent, the house - object. was demolished - Past Simple)
6. The students in the class read history books.
(the students - agent, history books - object. are read - Present Simple)
7. The cook prepared a nice dinner yesterday.
(the cook - agent, a nice dinner - object. was prepared - Past Simple)