Из пассивного в активный залог.
6)many houses are built in our town every year.
7)this work will be done tomorrow.
8)this text was translated at the last lesson.
9)these trees were planted last autumn.
10)many interesting games always are always played at our pt lessons.
11)this bone will be given to my dog tomorrow.
12. we were invited to a concert last saturday.
13. my question was answered yesterday.
14. hockey is played in winter.
15. mushrooms are gathered in autumn.
16. many houses were burnt during the great fire of london.
17. his new book will be finished next year.
18. flowers are sold in shops and in the streets.
19. st. petersburg was founded in 1703