A school owes its students a duty of care to protect them from foreseeable harm; that is, risks that the school knows or reasonably should know to exist.  Here, the school had no prior indication that one of its teachers was having an affair with an underage student.  The risk of inappropriate sexual behavior by teachers is not so great that a school owes a duty to supervise all of them whenever a teacher is alone with a student, absent some prior indication of heightened risk with a particular student.