The document discusses the passive voice in English and provides examples of its use. It covers:
1. When to use the passive voice, including when the subject is unknown or unimportant.
2. How to form the passive voice in various tenses, including the present, past, future, and perfect tenses. Modal verbs are also discussed.
3. Examples are given for active and passive voice sentences in different tenses to illustrate the structure and focus on the subject receiving the action rather than performing it.