How to change active to passive?

To change a sentence from active voice to passive voice, follow these steps:

1. Identify the subject, verb, and object in the active sentence.
2. Move the object of the active sentence to the beginning of the passive sentence.
3. Add the appropriate form of the verb "to be" (am, is, are, was, were) followed by the past participle of the main verb.
4. If necessary, include the original subject of the active sentence as the agent of the passive sentence (optional).

For example, let's change the active sentence "The cat chased the mouse" to passive voice:

Active: The cat (subject) chased (verb) the mouse (object).
Passive: The mouse (object) was chased (verb) by the cat (agent).

So, the passive sentence would be: "The mouse was chased by the cat."