I have opened the present.

1. The present has been opened by me.
2. The present had been opened by me.
3. The present was being opened by me.
4. The present is being opened by me.

Converting present perfect active “I have opened” to passive requires: object (present) becomes subject, auxiliary “has been” (singular), past participle “opened,” and optional “by me.” Present perfect passive indicates a completed action with current relevance—the present is now open. This transformation is useful when the action’s result matters more than the person who performed it.