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"We all know running has health benefits" isn't how I would write the sentence (I'd probably say "We all know that running offers many health benefits"), but is it formally incorrect? I want to say that you really need the "that" after "we all know," but I'm not sure.

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marked as duplicate by FumbleFingers, Matt E. Эллен, Hellion, user49727, choster Sep 25 '13 at 22:20

This question was marked as an exact duplicate of an existing question.

[on hold] the word that can be omitted where it introduces a subordinate clause, as in your case. – user51029 Sep 20 '13 at 22:57
...though it's not always advisable: We all assumed sitting positions were acceptable. – Edwin Ashworth Sep 20 '13 at 23:15

It's not necessary to use "that" here and then also the sentence would be formally correct. Both ways, the sentence is correct..

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