I don’t know if he knew the story. If he had known it, he would have told me.
Are there any correction needed?
anonymous Are there any correction s needed? No. The grammar is fine.
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anonymousAre there any corrections needed?
No. The grammar is fine.
However, the logic bothers me a little.
The sentence "If he had known it, he would have told me" implies that he did not know it, so the claim that "I don’t know if he knew the story" cannot be true. Clearly, you did know that