Example:
His favorite thing to do on weekends is watch movies.
Watching movies is his favorite thing to do on weekends.
1. It was difficult for her to remember all of the details of the accident.
2. It is interesting to study how the brain influences behavior.
3. It was impossible to find the suspect in the dark.
4. It takes time to develop a successful theory.
5. It can be dangerous to walk alone at night.
6. It is important to consider all of the factors.
7. It is the scientist's job to design good experiments.
8. It feels natural to help the people we love.