Ответ:
1. When i was a child i used to wear a lot of shorts. I didn't used to wear a lot of skirts.
2. When i was a child i used to eat a lot of vegetables. I didn't used to eat a lot of chees.
3. When i was a child i used to have a dog. I didn't used to have a cat.
4. When i was a child i used to have short nails. I didn't used to have long nails.