Question

Write questions using the passive. Some are present and some are past.1 Ask about glass. (how / make?) How is glass made?2 Ask about television (when / invent?)3 Ask about mountains. (how / form?)4 Ask about antibiotics. (when / discover?)5 Ask about silver. (what / use for?)​

Answer 1

1. When was television invented?

3. How are mountains formed?

4. When were antibiotics discovered?

5. What is silver used for?

Answer 2

1. How is glass made?
2. When was television invented?
3. How are mountains formed?
4. When were antibiotics discovered?
5. What is silver used for?