A: Why didn't you buy the car yesterday?#
B: I asked the price of the car, but they had already sold it.#
A: Why didn't you catch the train?#
B: I ran to the platform quickly, but the train had already left.#
He gave us our exercise books after he had corrected them.#
She went on holiday after she had taken the examination.#
She had finished the housework before she went out.#
We had had dinner before they arrived.&