1. Did he write about his observations to the Royal Society?
2. Не wrote about his observations to the Royal Society, didn't he?
3. What did he write about?
4. Who wrote about his observations to the Royal Society?
1. Did he write about his observations to the Royal Society?
2. Не wrote about his observations to the Royal Society, didn't he?
3. What did he write about?
4. Who wrote about his observations to the Royal Society?