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Some languages are used by a few people. Others, such as Mandarin Chinese and English, are spoken by millions. Many people speak two or more languages. They may use one language at home with family and friends, and another at work or school. Regional variations of language are known as dialects. The Anglo-Saxons, who conquered Britain at the end of the Roman Empire, spoke a Germanic language, which later became English. Other Germanic languages include Danish, Dutch, German and Swedish. English also contains French-derived words after it was ruled by French-speaking kings following the Norman Conquest.