Which of the following is the correct or more correct?

  1. Why do you think I know that?

  2. Why do you think that I know that?


Your both examples mean the same thing, #2 being just a little bit clearer.

The basic rule is that the conjunction that can be omitted as long as the meaning is not affected by doing so. But, as a sentence gets longer and more complex is better that the conjunction(s) that be left there for clarity's sake.

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  • +1 In this particular instance, however, I think most speakers would intuitively incline toward the version without the complementizer that, because that is employed in a different and more emphatic sense at the end of the sentence. – StoneyB on hiatus May 5 '15 at 17:35

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