Spoken language is a complex sequence of sounds. When we know the language, we have no difficulty in distinguishing consonants from vowels and in separating the sounds into individual words. When we hear a language that we do not know, it is more difficult to distinguish single words.
The human voice is capable of making a very large number of sounds, but the sound system of each language restricts the number of acceptable sounds to a relatively small number. The sound stream of a language consists of separate, ordered parts: syllables, words, phrases, clauses, and sentences. Understanding and learning language comes naturally to us because the structure of language is so logical. Language has syntax, which means that syllables and words are organized into meaningful constructions. Syntax is a condition of all human languages. It controls the flow of information and expresses relationships. Linguistic syntax is most obvious at the phrase, clause, and sentence levels.
One of the most interesting aspects of language is how it changes over time. There can be changes in a language’s sound system, such as a change in the pronunciation of a vowel.Such a change affects the “color” of the speech but has no effect on the meaning of a word. Change can also come in the creation of new words. Inventions, discoveries, and new contexts generate new words to describe them. Words also disappear as their relevant contexts disappear.
The vocabulary of a language has a great capacity to expand. The adoption of foreign words is part of the natural growth of almost any language. When language communities are forced together through political alliance or conquest, linguistic competition arises as two peoples try to converse. Often this results in a pidgin language, a mixing of words and expressions from the two languages.