The sentence "Some adult children may still be covered by their parents' medical insurance policies" is in passive voice.
Here's why:
1. In passive voice, the subject of the sentence is the receiver of the action, not the doer. In this sentence, "Some adult children" are the ones being covered by their parents' medical insurance policies, making them the recipients of the action rather than the ones actively performing it.
2. The verb "covered" is in the passive form (be + past participle "covered"), which further indicates that the sentence is in passive voice.
Therefore, the sentence is in passive voice because the focus is on the adult children being covered rather than on who is doing the covering.
