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deleted the tags associated with relative clauses, because OP's example does NOT involve relative clauses.
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F.E.
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Post Closed as "Duplicate" by tchrist, Brian Hooper, phenry, MrHen, Hellion
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tchrist
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Seirios
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I think/know vs. I think/know that

I wonder when verbs like think or know are followed by that; I encountered both forms, is there a difference?

For example,

I know that he did it. // I know he did it.

Are the two sentences both correct?