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This question already has an answer here:

Violence has got worst over the years. Or Violence has gotten worst over the years.

marked as duplicate by Centaurus, Community Nov 16 '15 at 1:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Are you speaking American English or British English? – Peter Shor Nov 16 '15 at 1:01
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Gotten is the past participle of to get, so to form the present perfect (the tense you are forming with has _) you would use it. Alternatively "Violence got worse over the years" would be correct, making it plain old past tense instead.

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