What are some ways to tell you are using non-verbal communication, when you have no idea you are doing it?

How does an instructor deal with an illiterate student? Many times in the college environment adjunct instructors are hired teach adult learners; but sometimes illiterate students are in their classroom, and instructors do not know how to deal with this type of learner. Illiterate students are a special case, as many times college instructors are not equipped to teach this type of student because they have not had the training to teach this student. How does an instructor teach this type of challenging student?