Passive Voice Complete Guide

Teach me passive voice in [TARGET LANGUAGE].

My level: [LEVEL]

Please cover:
1. What is passive voice and when to use it
2. Active vs. passive comparison
3. Passive voice formation:
   - Present tense
   - Past tense
   - Future tense
   - Perfect tenses
   - Progressive tenses (if applicable)

4. 20 example sentences:
   - Active version
   - Passive version
   - When passive is preferred

5. Agents (by-phrases):
   - When to include
   - When to omit
   - How to form

6. Impersonal passive (if applicable)
7. Passive with modal verbs
8. Passive infinitives and gerunds
9. When NOT to use passive
10. Academic/formal passive usage
11. Practice exercises:
    - Transform active to passive (15)
    - Transform passive to active (10)
    - Choose active or passive (10)
    - Error correction (10)

12. Answer key with explanations
13. Differences from English passive