1. This is middle school located in Chicago.

2. This is a middle school located in Chicago.

3. This is the middle school located in Chicago.

4. This is a boys' middle school located in Chicago.

5. This is boys' middle school located in Chicago.

(Are all grammatical? Which ones are grammatical?)

#s 1 and 5 are incomplete; #s 2, 3, and 4 are correct.