I Just Corrected the Grammar

Siapa yang punya toilet seperti ini?

Every day, an English teacher was seen coming out of the rest room with a marker,used for writing. In the rest room were expressions written on the walls. It was very bad.

Finally, the director of the school called the teacher into the office and told the teacher that it was terrible of him to write those things on the walls.

The teacher said,"I'm not writing those things. I just correct the grammar."

1. marker : spidol
2. rest room :  toilet
3. expressions :  tulisan-tulisan pendek
4. wall : tembok, dinding