In the passive voice, the sentence "Her answers impressed you" is changed to "Were you impressed by her answers?"
In the passive voice, the subject of the sentence is no longer the doer of the action (in this case, "her answers"), but instead, the focus is on the recipient of the action (in this case, "you"). The verb "impressed" remains the same, but "her answers" becomes the object of the preposition "by" to indicate the performer of the action, although it is not explicitly stated.
The passive voice is used when the emphasis is on the receiver of the action or when the doer of the action is unknown or unimportant. It allows for more flexibility in sentence structure and can be used to create a more formal tone or to shift the focus of the sentence.
I hope this helped!
~~~Harsha~~~