One teacher warned her students not to use "profound language."

When I was in high school, teachers were still warning us that girls couldn't be scientists.

Some angry teachers warned that they would soon be joined by their students and the students' parents if the demands were not met immediately.

All through his training, his teachers had warned him against complacency.

Some teachers warned that it was too abstract for 9-year-olds.

A suburban teacher said she sometimes stood children in the corner even though other teachers warned her to watch carefully for the principal.

Her teachers had warned her about that many times.

The teacher warned him not to look at his neighbour's paper, or risk getting a zero on the test.

In a dog-and-man world, it's them against us, the teacher warned.

Even worse, the students and other teachers had been quietly warned not to associate with him outside class.