Ответ:
1. If she had known about the party, she would have dressed up.
2. I I had gone to Scotland, I would have bought a kit for my mother.
3. Our Granny would have been surprised if we had presented her a bright dress and high-heeled shoes.
4. I would have never worn earrings even if they had been bought for me as a present.
5. If they had been New age travellers, they would have worn old black denim jeans.
это все III Conditional, повтори, это не так уж и сложно 😉
удачи!