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The most commonly used words are the ones evolving the most slowly, say researchers. In one of the papers, Harvard University researchers investigated the evolution of English verb conjugations across 1,200 years while the Reading University researchers reviewed cognates (words sounding similar in different languages carrying the same connotation) to discover how all Indo-European tongues have evolved from a common ancestor.

Researchers first examined some 210 words in 87 Indo-European languages. They then narrowed their focus to their usage frequency in four Indo-European languages-English, Spanish, Greek and Russian. They found that they were used at similar rates even if the synonymous words were not cognates. The high frequency words in Spanish are the same as the high frequency English. That indicated that we could come up with an Indo-European frequency of use.

The Harvard researchers studied the roots of English, tracing verb conjugations in the language from 1,200 years ago to its current form. Across time, several past tense forms of verbs have died out in English and now only one persists as a rule: adding -ed to the verb-ending. Research on grammatical texts from Old English catalogued all the irregular verbs. Among them: the still irregular sing / sang, go / went. After calculating their usage frequency, researchers determined that the words that evolved most quickly into regular forms were used less than others. In fact, given two verbs, if one was used 100 times less frequently than others, it would evolve 10 times faster than them. They predict that the past tense of wed will regularize from wed to wedded in near future.

The primary purpose of the passage is to

discuss the usage frequency of common words in four different Indo-European languages
convey the point that we are still uncertain about the origins of some words used in Indo-European languages
inform the reader about new research with regard to differential linguistic evolution
inform the reader about the controversy surrounding a particular issue in linguistic research
drive home the idea that within linguistic research, certain issues are still unresolved