В английском языке страдательный залог (passive voice) используется, когда мы хотим сфокусироваться на объекте действия, а не на том, кто выполняет это действие. Для формирования страдательного залога мы используем форму "be" причастие (past participle).
Вот решение задачи с объяснениями:
Most of things we buy are made in China these days. (present simple: are + made)I study Art – it is taught in my school. (present simple: is + taught)Were stamps sold in supermarkets yesterday? (past simple: were + sold)English is spoken here. (present simple: is + spoken)Was wine produced in England some years ago? (past simple: was + produced)Mistakes are made all the time. Nobody's perfect. (present simple: are + made)Breakfast is served from 7.30 to 10.00. (present simple: is + served)These programmes will be watched by people all over the world next year. (future simple: will + be + watched)The artist has sung three songs. Have three songs been sung by the artist? (present perfect: have + been + sung)Mr Brown has taken the umbrellas. Yes, the umbrellas have been taken by Mr Brown. (present perfect: have + been + taken)The policeman does a good job. Is a good job done by the policeman? (present simple: is + done)Did my friends find my keys? Yes, my keys were found by my friends. (past simple: were + found)The scientist wrote a book. A book was written by the scientist. (past simple: was + written)Все эти предложения подчиняются правилу формирования страдательного залога, указанному выше.