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。You can't say for sure that it won't rain tomorrow.明天难保不下雨.The fighting was over for sure.战斗确实结束了....

无疑，准保...

for sure的音标：for sure的英式发音音标为：[fɔ: ʃuə]for sure的美式发音音标为：[fɔr ʃʊr]...