You can't use 'that' in that sentence. You could in this one - I couldn't believe that it was so crowded.
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Anonymous Thank you for your reply! But there's an article from a university of Surrey with the title saying "Research shows that how students engage with feedback is as important as its content". Is that title wrong too?No, it's fine in that sentence. How is being used differently there. In the first sentence it means the extent of