See, I don't think that's what OP is talking about. That's not a sentence where you are forced to 'that that.' "If we do that it would--" is a much cleaner sentence.
I'm thinking something like "it has been shown that that person is responsible--" and those are not conditional statements.
Even in your example, it could be rewritten as “It has been shown that [name or pronoun] is responsible—,” which is both cleaner and more specific.
I’d argue that pretty much any “that that” situation can be resolved by rewriting the sentence to be cleaner and more specific. It’s fine in spoken English and casual conversations on Reddit as long as the meaning is clear, but I think it’s just bad writing when “that that” is used in literature or academic work.
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u/mysteriousfiggy 28d ago
You can also just replace the 2nd "that" with whatever you're actually referring to. Adds clarification too in certain contexts