Вот решения для каждого предложения в пассивном залоге:
1. **He wrote this book in the 19th century.**
*Passive:* This book was written in the 19th century.
*Объяснение:* В активном залоге субъект (He) выполняет действие (wrote). В пассивном залоге фокус переносится на объект (This book), действие (was written) выполняется над ним.
2. **They were playing tennis from four till five.**
*Passive:* Tennis was being played from four till five.
*Объяснение:* Здесь используется пассивный Continuous, акцент на процессе игры.
3. **He stole a lot of money from the shop.**
*Passive:* A lot of money was stolen from the shop.
*Объяснение:* Фокус переносится на деньги.
4. **By six o'clock they had finished the work.**
*Passive:* By six o'clock the work had been finished.
*Объяснение:* Используется пассивный Perfect, действие завершено к определенному моменту.
5. **At twelve o'clock the workers were loading the trucks.**
*Passive:* At twelve o'clock the trucks were being loaded.
*Объяснение:* Аналогично предложению 2, пассивный Continuous.
6. **By three o'clock the workers had loaded the trucks.**
*Passive:* By three o'clock the trucks had been loaded.
*Объяснение:* Пассивный Perfect.
7. **We send our daughter to rest in the south every year.**
*Passive:* Our daughter is sent to rest in the south every year.
*Объяснение:* В пассивном залоге используется Present Simple.
8. **They will show this film on TV.**
*Passive:* This film will be shown on TV.
*Объяснение:* Будущее время в пассивном залоге.