To correct the grammar and eliminate unnecessary words, we should replace "true" with a complete, grammatically correct sentence or phrase. "True" alone doesn't provide enough context for a precise revision; therefore, I'll assume you're looking for an affirmation, such as "That's correct."

History · College · Thu Feb 04 2021

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 You are correct in suggesting that the word "true" on its own may not provide enough context or detail in a grammatically correct sentence. It can be seen as an incomplete response. Instead, using a full sentence like "That's correct" or "This is true" provides a complete and more precise affirmation. These full sentences are grammatically sound and clarify the affirmation.