Tell please which sentence is correct.
I know for sure that he is right.
I know it for sure that he is right.
asked Jun 30, 2019 at 15:49
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1 Answer
In "I know it for sure." it is the object of "know".
In "I know for sure that he is right", that he is right is the object of "know".
You can't have two grammatically independent direct objects in the same clause, so your second option is not grammatical.
answered Jun 30, 2019 at 16:44
