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1.

That I love you is known to everyone.

It is known to everyone that I love you.

2.

That the earth is round is known to everyone.

It is known to everyone that the earth is round.

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Are all of the above sentences acceptable?

If not, would you please tell me the reason?

Thanks!

PS I also posted the same question on this , but all of your answers are unique to me. Hope we can discuss with each other. Thank you.

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They are grammatical but unnatural.

We'd say 'Everyone knows that I love you.'

'Everyone knows the Earth is round.'