Answer:
In general, passive voice can be used whenever the focus of the sentence is on the action itself, rather than on the one performing the action. For example, instead of saying, "John built the chair," we could say, "The chair was built by John." In this case, the focus is on the chair, and not on John; therefore, passive voice is used. This pattern is often used in academic writing, so that the focus is on the topic of the paper, rather than on the author.
Step-by-step explanation: