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The given word is "begin". The present participle would be beginning. The past form is began, and the past participle is begun. The word begin is one of the irregular verbs. Hope this answers your question. Have a great day!
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Crusades were taking place, other important changes were occurring in medieval society. Between 1000 and 1300, agriculture, trade, and finance made significant advances. Towns and cities grew. This was in part due to the growing population and to territorial expansion of western Europe.
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