用法及例句如下：
用法：
1.for sure adv.确实；毫无疑问地
2.I know for sure 我心里明白,我知道 .
3.But For Sure 但确 ; 只有一点可以肯定
4..??＋ that for sure .??,那是肯定的
5.For sure ＋句子 无疑,
例句有：
1、One thing is for sure ─ it's not going to be easy.
有一点可以肯定——事情不会很容易。
2、I think he'll be back on Monday, but I can't say for sure.
我想他星期一会回来，不过我不敢肯定。
3、Even to this day we don't know what happened for sure.
即使到现在我们也不确定究竟发生了什么。
4、No one knows for sure why adolescence is unique to humans
没有人确切地知道为什么只有人类才会经历青春期。
5、One thing's for sure, Astbury's vocal style hasn't changed much over the years
有一点可以肯定，阿斯特伯里的演唱风格多年来没怎么改变。
6、Or not. This being China, no one knows for sure.
也许不是，这就是中国，没人能确切知道答案。
7、No one can say for sure how much longer the crisis will last.
没有人能确切地说这场危机还会持续多久。
8、Whatever it is, one thing is for sure — smart home technology will change the way we live and work.
不管是什么,有一点是肯定的,智能家居技术将改变我们的生活和工作方式。
9、When they get to know me and to trust me, knowing for sure I'm not selling them something — there'll be more honest feedback from them.
当他们了解我，信_我，确信我不是在推销时，就会给出更真实的反馈。
10、But one thing's for sure — if you don't like the feeling of a burning tongue, this festival isn't for you!
但有一件事是肯定的——如果你不喜欢舌头辣辣的感觉，这个节日就不适合你！