Przekształć zdania na stronę bierną (present simple lub past simple). Użyj przyimka ,,by" tam, gdzie to konieczne.
1 George Lucas directed the film.
2 People invented the wheel around 5,500 years ago.
3 How do they collect the data?
4 Over a billion people speak Mandarin Chinese.
5 My sister designed this necklace.
6 They sell snacks at morning break.