Make constant eye contact. Don't try to communicate with a nonverbal student, unless in a group situation, without it. Move your head to a position where you can make eye contact if the student doesn't make it himself.
Move close to the student. Proximity depends on how well the student receives your messages. For example, a student unwilling to make eye contact requires that you move within 6 inches or less so you can catch his eyes. A student willingly communicating with you may only require a normal proximity, as if you were speaking to a verbal person.
Learn sign language and know any signs specific to the student. Many nonverbal students use a small pool of signs to communicate, or even create their own signs.
Tailor your spoken sentences to the individual. Some students will respond to full sentences that you can communicate in a similar way to communicating with other children. Other nonverbal students require short, to-the-point sentences. For example, you might say, “Stand up please,” while using the sign to stand up.
Use a tone of voice the student responds to best. To some students, a cheery tone of voice will get their attention, while to others it won't sound firm enough and they'll ignore you. Conversely, one student may take a firm, authoritative voice as a sign you're angry while others will respond immediately.
Speak with your face, and take cues from the student's face. Your face can betray you if you're bored or angry. Make sure your face says that you like the student. Similarly, notice the student's face. It can tell you if he's angry, irritated or confused.