Answer:
Facial Expressions, hand gestures, touch, eye contact, etc
Step-by-step explanation:
Facial expression can help you see how a person is feeling and what they are looking for, it can be used from saying yes and no, to showing what they want.
Hand gestures can be used to point, show, and maybe even do sign language.
Touch can show whether a converstation wants to be started or if something is wrong.
Eye contact can show that a person is interested in talking with you.