2 It had changed a lot.
3 She had arranged to do something else.
4 The film had already started
5 I hadn't seen him for 5 years
6 She had just had some breakfast
2 I had never heard this song before
3 He had never played tennis before so he played badly.
4 We had never been there before.
(везде используем PAST PERFECT так как даны предложения в PAST SIMPLE c результатом в прошлом)