SIMPLE PAST or PAST PERFECT TENSE need answers

1. Had he known her for a long time before they got married?

2. He drove down the hotel where they had spent their honeymoon years ago.

3. When we got to the station the train had already left.

4. He sat at a table by the window where he had had a meal with Jane.

5. Why hadn't he asked her to wait and think again before she left Paris?