To be really obvious, we can use touch to communicate. When we punch someone, we communicate hatred. When we hug them, we communicate affection.
On a more subtle note, we can communicate with our body language. We can shrink away from people that we do not feel comfortable with. This communicates our unease in their presence. My students for a few years would laugh at me because whenever a certain teacher came into my room to talk to me or a student, I would physically move away from her, stand farther away and then lean away as well. I really did not like her and this communicated itself to my students, who thought it was very funny.