（1）be sure of / about … 对……有把握
例如：
对某事有把握 be certain of sth 抽烟和喝酒对你不好 Smoking and drinking do badly in your health.~~~祝你学习进步，更上一层楼！不明白请及时追问，满意敬请采纳，O(∩_∩)O谢谢~~。
Are you sure about it？
你对此有把握吗？
I'm sure of myself.
我对自己有把握。
（2）be sure to do sth. 一定会做某事
例如：
He is sure to win the game.
他一定会赢得比赛。
be sure of 【例句】He seems to be quite sure of it.他似乎对此很有把握。对……有把握的英文 I am sure。 后面加that从句。可以省略that.望采纳!我们对这次成功有把握英文 我们对这次成功有把握 英文：We are 。
（3）be sure that +从句 其中that可省略，意为“相信……”。例如：
I'm sure they will win the game.
我相信他们会赢得这场比赛。
（4）be not sure +whether/if 从句，意为“不确定是否……”。例如：
I'm not sure whether they can come or not.
我不能肯定他们是否会来。
I'm not sure whether /if there are UFOs.
我不确定是否有不明飞行物。
be sure about或者be confident of success
Let's have a try.
be sure of 英 [bi: ʃuə ɔv] 美 [bi ʃʊr ʌv]确信 1.She looked over her shoulder to be sure of her footing.她扭头看了看后面以确认自已是否站稳了。2. He likes 。
谢谢！
