1. What is taken by somebody?
2. What was left in taxi?
3. What will be cooked in time?
1. Is the book taken by somebody?
2. Were these things left in taxi?
3. Will dinner be cooked in time?
1. The book is taken by somebody, isn't it?
2. These things were left in taxi, weren't they?
3. Dinner will be cooked in time, won't it?
1. Who is the book taken by?
2. Where were these things left?
3. When will dinner be cooked?