mean "hello."]]> started writing about 5,000 years ago.]]> people to communicate.]]> came later.]]> borrow words from others.]]> phones."]]> ancestors.]]> understand language.]]> existing words, too.]]> trying to communicate with one another.]]> develop societies.]]> message across.]]> mixtures are called pidgin languages.]]> speak right after they are born.]]> sign language, too.]]>