why is it that we can structure a sentence like “I’m in school” but not “I’m in nightclub”?

Question

Some nouns have to have “the” before it but seems like not all of them need it, so any explanations would be helpful!

edit: wow, didn’t expect so much traction on this. Thank you for your explanations! Interestingly, I’m actually a native English speaker but don’t really know grammar terminology all that well. Thanks for sharing your knowledge!

In: 1233

Answer 1

I’ve always thought its because you are in an education program.

Being in a program and in school became synonymous.