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We know this because of the words, writing styles and through history. All Indo-Euroepean Languages, use a very similar style of grammar, poetic styles, syntax, and samatics.

Further through writings we can see that these languages have evolved very precisly through time, in Europe it began with German, Greek, and Latin, which was based off of Phoenician,

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βˆ™ 14y ago
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βˆ™ 4mo ago

Linguists have compared similarities in vocabulary, grammar, and phonetics across Indo-European languages to trace their origins to a common ancestor, known as Proto-Indo-European. By studying these linguistic features, researchers have been able to reconstruct this ancient language and map its evolution into the diverse languages we see today.

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Q: How do you know that all Indo-European languages have a common ancestor?
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