It looks like you’re referring to a specific grammar exercise about the passive voice, possibly from a textbook. While I don't have access to that specific task, I can help explain the passive voice and give examples.

### Passive Voice Overview

In the passive voice, the focus is on the action rather than who performs it. The structure generally follows this format:

**Subject + be + past participle + (by + agent)**

### Examples:
1. **Active:** The chef cooks the meal.
**Passive:** The meal is cooked (by the chef).

2. **Active:** The students completed the project.
**Passive:** The project was completed (by the students).

### Exercises:
1. Change the following sentences from active to passive:
- The teacher explains the lesson.
- The company will launch a new product.

2. Rewrite these passive sentences in active voice:
- The book was written by J.K. Rowling.
- The song was sung by the choir.

If you have specific sentences from the task that you’d like help with, feel free to share!