3 Key:
1 Didn't Zoe visit Yellowstone National Park last summer?
2 Isn't it his dream to become a famous singer?
3 Can't she come to football practice this afternoon?
4 Haven't they bought tickets for the new film?
5 Weren't Corey and Christy at the beach at two o'clock?
6 Didn't you call him several times?
4 Key:
1 have to
2 should / must
3 shouldn't
4 mustn't / shouldn't / don't have to
5 have to
6 have to