However, it's likely incomplete and needs more context to understand the full meaning. For example, it could be part of a sentence like:
* "Mi maestro no está aquí." (My teacher is not here.)
* "Mi maestro no me entiende." (My teacher doesn't understand me.)
* "Mi maestro no es muy estricto." (My teacher isn't very strict.)
To understand the meaning, you need to consider the entire sentence and the context in which it is used.