Your teacher can not be your classmate, but your friends and siblings can be if they are the same age as you.

The teacher is in charge of the class.

You can talk freely with your friends during the break between classes.

School is the correct spelling, it is the place where you go to learn about new things.

Classroom is the place where you have your classes.

Happiness is the correct translation.

Honesty is translated as iskrenost.

Ravnatelj is the correct translation of the word principal.

A pencil is used to write things down in a notebook.

The word ploča is translated as blackboard, it is where the teacher writes down things in class.

Your classmates can be your friends, they are the same age as you.

While you are in your classroom you sit on a school bench.

Friend is translated as prijatelj.

Blackboard is translated as ploča, it is where your teacher writes things down when explaining.

Your teacher writes things down on a blackboard (ploča).

Your classmates do not work in a school.

Bench is the other word for desk, it is where you put down your notebooks, pencils and where you write in school.

Friend is the correct spelling.

You have your subjects and classes in your classroom.

Classmates is the correct spelling. Classmates are your friends from your class.