Where was it brought?
One of the key rules in changing a sentence from passive voice to active voice is identifying the subject of the sentence and making it the doer of the action. In the passive voice sentence "Where was it brought?", the subject is not clearly defined. Therefore, we need to determine who or what brought something to a certain place.

Identifying the subject
To change this passive voice sentence to active voice, we need to first identify the subject. In this case, "it" is the subject of the sentence. However, it is not clear what "it" refers to, so we need to provide more context to determine who or what brought something.

Providing context
Adding more information to the sentence can help us identify the subject. For example, if we say "Where was the package brought?", the subject becomes "the package". Now we know that the package was brought somewhere, and we can proceed to change the sentence to active voice by making the subject the doer of the action.

Changing to active voice
After determining the subject and providing context, we can change the sentence to active voice. For example, "The package was brought to the office" can be changed to "Someone brought the package to the office". By making the subject the doer of the action, we have successfully transformed the sentence from passive voice to active voice.
In conclusion, when faced with a passive voice sentence like "Where was it brought?", it is important to identify the subject, provide context, and then change the sentence to active voice by making the subject the doer of the action.