Rewrite the given text and correct grammar, spelling, and punctuation errors. If you'd told me year ago that today I would finish a marathon, I would of laughed. Your support had a huge affect on me!

If you had told me a year ago that I would finish a mar athon , I would have laughed . Your support had a huge impact on me ! \n Cor rect ed grammar , sp elling , and pun ctu ation errors : \n * " If you ' d told me " should be " If you had told me " ( correct use of the past perfect t ense ) \n * " I would of " should be " I would have " ( correct use of the contra ction for " I would have ") \n * " aff ect " should be " imp act " ( correct sp elling ) \n * " a huge affect " should be " a huge impact " ( correct sp elling ) </s>