types of words, the most basic of which are nouns and verbs.]]> borrow words from another language.]]> replaces the original language of the group, it is called a creole language.]]> ideas, and verbs describe action.]]> ancestors initiated the use of spoken language several million years ago, and humans began writing about 5,000 years ago.]]> foundation of language.]]> forms of language, such as writing and sign language, must be taught.]]> understand language.]]> develop.]]> ability to understand language.]]> know their language.]]> began writing about 5,000 years ago.]]> gestures, or body movements.]]> local expressions.]]> speech.]]>