Harry has a new classmate, Greg, who is Deaf. Harry has noticed that when Greg signs with his interpreter he often tilts his head, moves his shoulders, and shifts his weight from side to side. What is the reason for Greg's movements? O Deaf people often are born with nervous tics. © Greg was very nervous about his first day at a public school. His movements are part of the ASL grammar. He was having an argument with his interpreter.​