Odpowiedź:
1. Ani told us (that) she was joining a yoga class.
2. Nick said (that) he hadn't swum in the swimming pool.
3. Catherine told them (that) she had never broken a bone in her body.
4. Amy said (that) she hadn't come out in spots until an hour after eating.
5. Mia said (that) the air pollution on Wrocław was really bad.
Wyjaśnienie:
Reported Speech to tzw. cofanie czasów,
np. Jeśli zdanie cytowane w 1. było w Present Continuous, my cofamy do PAST Continuous itd.
ENJOY!