Ask questions using the passive 1. About the telephone (when / invent?)
2. About glass (how / make?)
3. About Volkswagen cars (where / make?)
4. About silver (what / use for?)
5. About television (when / invent?)
6. About jeans (what / make of?)
7. About coffee (how / make?)
1. When was the telephone invented?
2. How is glass made?
3. Where are Volkswagen cars made?
4. What is silver used for?
5. When was television invented?
6. What are jeans made of?
7. How is coffee made?