It seems to me both "Not if I can help it" and "If I can help it" can be used for the same scenario. I wonder how to determine which to use.
Person A: Tom is going to win the race tomorrow, Person B: Not if I can help it. I' think I'm faster. You can't remove 'not' here.
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Person A: Tom is going to win the race tomorrow,
Person B: Not if I can help it. I' think I'm faster.
You can't remove 'not' here.