Przekształć zdania na stronę bierną (present simple lub past simple). Użyj przyimka 'by' tam gdzie jest to konieczne.

1. George Lucas directed the film.
2. People invented the wheel around 5,500 years ago.
3. How to 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.