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When we talk about English,
we often think of it as a single language
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but what do the dialects spoken
in dozens of countries around the world
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have in common with each other,
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or with the writings of Chaucer,
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and how are any of them related
to the strange words in Beowulf?
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The answer is that like most languages,
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English has evolved
through generations of speakers,
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undergoing major changes over time.
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By undoing these changes,
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we can trace the language
from the present day
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back to its ancient roots.
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While modern English
shares many similar words
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with Latin-derived romance languages,
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like French and Spanish,
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most of those words
were not originally part of it.
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Instead, they started coming
into the language
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with the Norman invasion
of England in 1066.
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When the French-speaking Normans
conquered England
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and became its ruling class,
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they brought their speech with them,
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adding a massive amount
of French and Latin vocabulary
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to the English language
previously spoken there.
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Today, we call that language Old English.
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This is the language of Beowulf.
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It probably doesn't look very familiar,
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but it may be more recognizable
if you know some German.
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That's because Old English
belongs to the Germanic language family.
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First brought to the British Isles
in the 5th and 6th centuries
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by the Angles, Saxons, and Jutes.
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The Germanic dialects they spoke would
become known as Anglo-Saxon.
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Viking invaders in the 8th
to 11th centuries
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added more borrowings
from Old Norse into the mix.
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It may be hard to see the roots
of modern English
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underneath all the words borrowed
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from French, Latin, Old Norse
and other languages.
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But comparative linguistics can help us
by focusing on grammatical structure,
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patterns of sound changes,
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and certain core vocabulary.
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For example, after the 6th century,
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German words starting with "p,"
systematically shifted to a "pf" sound
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while their Old English counterparts
kept the "p" unchanged.
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In another split, words
that have "sk" sounds in Swedish
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developed an "sh" sound in English.
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There are still some English
words with "sk,"
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like "skirt," and "skull,"
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but they're direct borrowings
from Old Norse
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that came after the "sk" to "sh" shift.
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These examples show us
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that just as the various Romance languages
descended from Latin,
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English, Swedish, German,
and many other languages
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descended from their own common ancestor
known as Proto-Germanic
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spoken around 500 B.C.E.
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Because this historical language
was never written down,
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we can only reconstruct it
by comparing its descendants,
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which is possible thanks
to the consistency of the changes.
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We can even use the same process
to go back one step further,
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and trace the origins of Proto-Germanic
to a language called Proto-Indo-European,
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spoken about 6000 years ago
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on the Pontic steppe
in modern day Ukraine and Russia.
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This is the reconstructed ancestor
of the Indo-European family
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that includes nearly all languages
historically spoken in Europe,
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as well as large parts of Southern
and Western Asia.
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And though it requires a bit more work,
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we can find the same systematic
similarities, or correspondences,
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between related words in different
Indo-European branches.
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Comparing English with Latin,
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we see that English has "t"
where Latin has "d",
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and "f" where latin has "p"
at the start of words.
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Some of English's more distant relatives
include Hindi, Persian
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and the Celtic languages it displaced
in what is now Britain.
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Proto-Indo-European itself descended
from an even more ancient language,
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but unfortunately, this is as far back
as historical and archeological evidence
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will allow us to go.
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Many mysteries remain just out of reach,
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such as whether there might be a link
between Indo-European
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and other major language families,
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and the nature of the languages spoken
in Europe prior to its arrival.
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But the amazing fact remains that nearly
3 billion people around the world,
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many of whom cannot understand each other,
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are nevertheless speaking the same words
shaped by 6000 years of history.