adverb
Sure enough is an adverb phrase that means without doubt or certainly.
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After conducting a thorough investigation, sure enough, we found the missing documents in the filing cabinet.
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I didn't believe it at first, but sure enough, my favorite band is coming to town next month!
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I thought it was just a rumor, but sure enough, the party was lit!
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Just when I thought everything was going smoothly, sure enough, life threw me a curveball.