There are two basic rules for converting sentences from Active Voice into Passive Voice, which are common for all tenses. The places of subject and object will be interchanged in the sentence. Only 3rd form of the verb or Past Participle (e.g. written) will be used as a main verb in Passive Voice.

Rules of Active and Passive Voice:

Active and passive voice are two different ways of expressing an action or a state in a sentence. In active voice, the subject of the sentence performs the action, while in passive voice, the subject receives the action. Here are the rules to change from active to passive voice:

1. Identify the subject and the object:
In order to change a sentence from active to passive voice, you need to identify the subject and the object. The subject is the one who performs the action, and the object is the one who receives the action.

2. Move the object to the subject position:
In the passive voice, the object of the active sentence becomes the subject. It is placed at the beginning of the sentence.

3. Use the appropriate form of the verb 'to be':
Next, you need to use the appropriate form of the verb 'to be' (am, is, are, was, were) based on the tense of the active sentence. This verb is followed by the past participle of the main verb.

4. Use the past participle of the main verb:
The main verb in the active sentence needs to be changed to its past participle form. Regular verbs form their past participle by adding 'ed' to the base form, while irregular verbs have different forms.

5. Include the preposition 'by' (optional):
In passive voice sentences, the preposition 'by' is often used to indicate the doer of the action. However, it is not always necessary to include it. If the doer is unknown or not important, it can be omitted.

Example:
Active Voice: The teacher teaches the students.
Passive Voice: The students are taught by the teacher.

Visually Appealing Format:
- Rule 1: Identify the subject and the object.
- Rule 2: Move the object to the subject position.
- Rule 3: Use the appropriate form of the verb 'to be'.
- Rule 4: Use the past participle of the main verb.
- Rule 5: Include the preposition 'by' (optional).

Example:
- Active Voice: The teacher teaches the students.
- Passive Voice: The students are taught by the teacher.

By following these rules, you can effectively change a sentence from active to passive voice. Remember to consider the tense of the sentence and use the appropriate form of the verb 'to be' along with the past participle of the main verb.