teaches, teach!
What language do you teach?
Insegna ai suoi figli come ferire il prossimo.
He teaches his children how to hurt others.
Does your sister teach there?
L'insegnante insegna alla studentessa.
The teacher teaches the student.
Lei insegna storia, è una donna intelligente.
She teaches history; she is an intelligent woman.
— Quando volano le cicogne (1957)
The teacher isn't teaching.