Make Past Indefinite and Future Indefinite Passive of these sentences

1. These books are sold everywhere.

2. The students are given much homework everyday.

3. What kind of books are usually discussed at your lessons?

4. He is often asked to translate articles from English into Russian.

5. This example is often referred to.

1These books were sold everywhere.

These books will be sold everywhere.

2The students were given much homework every day.

The students will be given much homework every day.

3What kind of books were discussed at your lessons?

What kind of books will be discussed at your lessons?

4He was often asked to translate articles from English into Russian.

He will be often asked to translate articles from English into Russian.

5This example was often referred to.

This example will be often referred to.