Phonology - an element of oral language dealing with pronunciation of the words and how our speech organs move to produce sound
Vocabulary - the word we choose to use in talking to other people is one of the important factors in our successful conversation and communication
Morphology - if focused on the smallest units of meaning within a word, as well as the rules about how those words are formed including roots, suffixes, and prefixes.
Grammar - the rules of grammar helps us decide the order we put words in which form of a word to use
Pragmatics - require the understanding of the social use of language