A: Hasn't anyone repaired this car yet?#
B: It has already been repaired.#
A: Hasn't anyone corrected the exercise books yet?#
B: They have already been corrected.#
A: Hasn't anyone caught the thief yet?#
B: He hasn't been caught yet. He will be caught soon.#
A: Hasn't anyone caught the thieves yet?#
B: They haven't been caught yet. They will be caught soon.&