The core of the English language descends from the Old English language, brought from the 500s with the Anglo Saxon, and Jutish settlers to what would be called England. The bulk of the language in spoken and written texts is from this source. As a statistical rule, around 70 percent of words in any text are Anglo-Saxon. Moreover, the grammar is largely Anglo-Saxon. While some new words enter English as slang, most do not. Some words are adopted from other languages; some are mixtures of existing words (portmanteau words), and some are new creations made of roots from dead languages.