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This question already has an answer here:

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?

marked as duplicate by tchrist, Brian Hooper, phenry, MrHen, Hellion Jan 21 '14 at 16:45

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Yes, they are both correct. I'd use the second because that's more idiomatic and shorter than the first one. There are times when you don't need "that" in a sentence and this seems to be one of those instances.

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