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The correct sentence is “I do not know if I will go.”
In order to be correct, the sentence with “whether” should be “I do not know whether I will go or not.”
“Whether” always requires the use of “or not” while “if” does not.
Example: “I wonder if you believe me” stands alone, whereas “I wonder whether you believe me or not” needs the “or not.”
In order to be correct, the sentence with “whether” should be “I do not know whether I will go or not.”
“Whether” always requires the use of “or not” while “if” does not.
Example: “I wonder if you believe me” stands alone, whereas “I wonder whether you believe me or not” needs the “or not.”