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Ответ:

1. I wish I hadn't watched the horror film because I felt scared.

If I hadn't watched the horror film, I wouldn't have felt scared.

2. I wish I could take part in the ballet performance, but I've got the flu.

If I didn't have the flu, I could take part in the ballet performance.

3. I wish I had gone to the opera on Friday evening despite my headache.

If I had gone to the opera, I wouldn't have missed the show because of my headache.

4. I wish I had enough money to buy this album.

If I had enough money, I could buy this album.