Change the following active constructions into passive ones When she arrived, her parents had bought a smart watch. _ Yesterday I watched an exciting film with my friends. _ They can visit our local theatre at the weekend. _ The teacher is tuning his flute now. _ She has seen a new performance on the stage. _ When we came, mum was cooking pies.

1) he may not read this book. 2) mary might forget to call you. 3) they could go to the fitness centre.

1. at, in

2. from, to, on

3. to, about

4. from, under

5.by, on, to 

1. i knew this person2. he read the book3. you do this exercise

1. i exercise regularly in summer but more to do in winter. 2. she usually walks slowly but now she is walking even   faster . 3. nina speaks loudly but mary speaks even   louder . 4. he runs fast, than other boys. 5. i don’t sleep enough, less   than 8 hours. 6. he behaves badly, than other boys. 7. i smile often, more than my sister. 8. peter lives far from school, but ann lives closer .

я думаю, что  4 и в 6 предложениях ничего изменять не надо. может я ошибаюсь.