The term 'For Sure' can be expressed in many different ways, from the simple three letter word 'YES' to the more emphatic thirteen letter phrase 'Without a Doubt'. Other words and phrases that can be used to express certainty include 'REALLY', 'AMEN', 'YEAH', 'Bygum', 'Ohyes', 'Uhhuh', 'INDEED', 'Youbet', 'Ofcourse', 'Byallmeans', 'DEFINITELY', and 'Youcancountonit'. All of these words and phrases are used to express a sense of certainty or agreement.