Final answer:
The passive voice phrase 'or are enrolled unwillingly' emphasizes the state of being enrolled rather than who enrolls the students, thus focusing on the unwillingness aspect.
Step-by-step explanation:
The phrase "or are enrolled unwillingly" in sentence 5 is an effective use of the passive voice because it focuses attention on the unwillingness of the receiver or object. When using the passive voice, the subject of the sentence is being acted upon, which can emphasize the action or state being experienced rather than who is performing the action. An example of converting from passive to active voice would be from "That his house was no place for a dance party was argued by Jose" to "Jose argued that his house was no place for a dance party". However, the original passive construction draws attention to the fact of the argument over the house suitability rather than Jose's personal stance, showing how passive voice can impact the focus of a sentence.
The phrase "or are enrolled unwillingly" in sentence 5 is an effective use of the passive voice because it focuses attention on the unwillingness of the receiver or object. It shows that some students are enrolled in advanced-placement courses without their consent or desire. This use of the passive voice emphasizes the lack of agency or choice on the part of the students.