In a previous class, we learnt about paralanguage and intonation, both interesting and entertaining topics. As we saw, there are other ways how we can communicate with others, that means, we do not just use our speech, but we also express feelings, opinions, mandates, etc. through the body language, expressions and gestures, vulume, tone of voice, and in some cases intonation of speech, which are includes in paralanguage.
clarifying all kind of doubts, I am going to give you a definition of paralanguage. It is supposed that paralanguage is not about what something is said but how something is said. According to some authors, paralanguage refers to the nonverbal parts of communication, used to express or modify meaning and convey or share emotions. It also could be conveyed consciously ( for example when you have to communicate something with a purpose) or unconsciously. (just because, or in an spontateous way)
Remember that we listened in the recorging the word yes ten times in different ways. The main purpose of that activity was we realized that throught the intonation of words we can transmit a meaning, and this meaning is the feeling. in the word yes people in the recorging express feeling such as happiness, confidence, annoyance, and others.
I already have said that paralanguage involves lots of elements, one of them is body language, which involves feelings and physical expressions such as body pose, gestures, eye contact, etc. Sometimes the use of body language is an interpersonal way to communicate. In a classroom body language can be useful and helpful for both a better interaction between teacher and students and understanding of words. With imperative forms or in questions we can use a lot body language. for example Would you please sit down? here the teacher can do use of body movement, put his or her hands down, and friendly gestures like a smile.
Here there are some links that could help you to understad better this topic:http://126.96.36.199/search?q=cache:MTBKllM9xPUJ:faculty.tnstate.edu/bchristian1/chapmanpp.ppt+what+is+paralanguage&cd=6&hl=es&ct=clnk&gl=mx