We discuss the affective aspects of tutoring dialogues in an ITS -called INES- that helps students to practice nursing tasks using a haptic device and a virtual environment. Special attention is paid to affective control in the tutoring process by means of selecting the appropriate feedback, taking into account elements of the student's character, the harmfulness of errors made, and the emotional effects of errors and feedback. The tutoring system will adjust both the affective language used and the overall teaching tactics.