Answer:
3.1. The school building is very old, so it does not have ramps for wheelchair access.
3.2. The learner said she had left her book at home but borrowed one from a friend.
3.3. I eat popcorn while watching a movie.
3.4. There were not enough masks and gloves for everyone.
3.5. It was her who told me what was going on.
3.6. No one in the group remembers when the books were returned.
3.7. My brother is better at soccer than I am.
3.8. Please pass me those books.
3.9. The athletes are running slow because they are tired.