Change the voice (Active to Passive): I didn't enjoy the meal. The cook had cooked the vegetables too long.
Q1. Change the voice (Active to Passive): I didn't enjoy the meal. The cook had cooked the vegetables too long.
Answer: I didn't enjoy the meal. The vegetables had been cooked too long.
Explanation: In active-to-passive conversion for past perfect, "had cooked" becomes "had been cooked"; the cook (agent) is dropped as the focus shifts to the vegetables.