This question is a very interesting one for me because I used the expressions with "school" from patterns until now, but now I want you to suggest me when to use which expression. Where's the difference between: in school at school in the school at the school ??? I used Google to learn things from patterns, and here's my result: in school (I would have used "in schools") at school (I would have used "in schools" as well) in the school (I would have used "at school") at the school (I would have used "in school") I know that we use the definite article before school where we are referring to a specific school, e.g. "I'm going to the King George High School". But I don't get the different meanings of all the other ones. Could you provide some examples in additon, please?