Which sentences use a comma in a way that is considered contested usage

Answer 1

1. "I would like to go to the movies, but I have no money."
2. "She was tired, and she needed to rest."
3. "I enjoy running, swimming, and hiking."
4. "They went to the store, and they bought some groceries."
5. "He is studying biology, and she is studying psychology."
6. "The car is blue, and it is also very fast."
7. "She went to school, then she went to work."
8. "I am confident, however, that we will succeed."
9. "In my opinion, the book was much better than the movie."
10. "He runs every day, yet he still feels out of shape."