составить предложение в повествовательном вопросительных и отрицательных в past perfect

1) He had returned from the cinema by 8 o’clock
2) Had he returned from the cinema by 8 o’clock?
3) He hadn’t returned from the cinema by 8 o’clock

1. She came to the office to meet him, but he had already left.

2. Had he already left when she came to the office to meet him?

3. She came to the office to meet him and, fortunately, he hadn't left.