The phone had been hung up suddenly by Rey. Changes the passive voice to the active voice or the active voice to the passive voice.

Rey suddenly hung up the phone.

Passive voice: The phone had been hung up suddenly by Rey.

Active voice: Rey had hung up the phone suddenly.

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

1. Identify the subject and object in the sentence.
- The subject is the doer of the action, and the object is the receiver of the action.

In the given sentence: "The phone had been hung up suddenly by Rey."
- Subject: The phone
- Object: None specified, but implied that it was hung up by Rey.

2. Determine the tense and auxiliary verbs used.

In the given sentence: "had been hung up."
- Tense: Past perfect
- Auxiliary verbs: "had been"

To change from passive to active voice:
- Place the subject (doer of the action) at the beginning of the sentence and make it the subject.
- Convert the verb form to the corresponding tense of the active voice.
- If required, include the object (receiver of the action) introduced with a preposition.

Active voice: "Rey suddenly hung up the phone."

To change from active to passive voice:
- Place the object (receiver of the action) at the beginning of the sentence and make it the subject.
- Convert the verb form to the corresponding tense of the passive voice.
- Add the respective auxiliary verbs if needed.

Passive voice: "The phone was hung up suddenly by Rey."

Note: The change from active to passive voice might require modification in the verb tense and word order, as well as the addition of prepositions like "by."