That's much more complicated.
Try getting a handle on the meanings of the bare "school" in this:
A: Where is Sue?
B: She is in school today. She was ill yesterday, but today she is OK, and she is back in school.
A: Did you drive her to school?
B: No, she walked to school, as usual.
A: Speaking of school, does she like it?
B: Does she like what? You mean her school? No, she hates it.