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Use "for sure" in a sentence
"REally the only way to know for sure if the quality and everything is good is go to a store that has this model in stock and compare it to everything else, then you'll know."
"That was when I knew for sure that he was seriously depressedthe boy never wore outerwear."
"However, it is important to note that, while we can achieve these incredible feats of technology, we still do not know for sure whether gravity is a physical force, the bending of space-time, or a property of superstrings that actually creates mass rather than the other way around; and there are additional credible theories about gravity still in contention."