Rewrite these sentences. Instead of using 'somebody' or 'they', write a passive sentence:
1) Somebody has carried out this experiment. This experiment
2) They have patented their invention. Their invention
3. Somebody is using the heliograph at the moment. The heliograph
4. I didn't know that somebody was recording our talk.
I didn't know that our talk
5. When we got to the conference hall we found that they had cancelled the presentation.
When we got to the conference hall, we found that

zhorik2006nice    3   10.01.2022 15:30    2