be sure of 的音标为 英 [bi: ʃuə ɔv]，美 [bi ʃʊr ʌv]，核心含义是“确信、对……有把握”，强调对某个具体对象或结果的确定性，主语通常是人[5][6]。它常接名词、代词或动名词，表达对事实、能力、结果等的肯定判断。

用法解析

后接具体对象：表示对某事物有明确把握，如事实、结果或个人能力。
例：She is sure of her success.（她对自己的成功很有信心）

与 be sure that 转换：当后接从句时，可与 "be sure that" 结构互换，意义不变。
例：I'm sure of success. = I'm sure that I will succeed.（我确信会成功）

与 be sure about 的区别：两者常可互换，但 "be sure of" 更强调对具体对象的确定性，而 "be sure about" 侧重对抽象概念的把握[6]。

例句

Can I be sure of a profit if I invest?（我要是投资，肯定能获利吗？）[8]

Book early if you want to be sure of a seat.（要想十拿九稳有个座位，那就早订座。）

He likes to be sure of his bodily comforts.（他注重身体上的舒适。）[8]

She looked over her shoulder to be sure of her footing.（她扭头看了看后面以确认自己是否站稳了。）

A lot of people think that it's better to pay for their education so that they can be sure of getting quality.（许多人认为最好是接受付费教育，这样能确保教学质量。）

I left a message so as to be sure of contacting her.（我留下了张条子以便与她取得联系。）

As Jordan joined our team, we are sure of winning the game this time.（乔丹加入我们队后，我们确信这次能赢。）

The first thing to be sure of is whom science should serve.（首先要明确的是科学应该为谁服务。）

You can always be sure of a warm welcome at my house.（您什么时候到我家来都会受到热情欢迎的。）

Testing helps manufacturers to be sure of a product's quality.（测试帮助制造业者确定产品的质量。）

短语搭配

be sure of oneself：自信，对自己有把握
例：To succeed in something, you must be sure of yourself.（要想成功，你必须有自信心。）

be sure of doing sth.：确信会做某事
例：They are sure of winning the competition.（他们确信能赢得比赛。）

掌握 "be sure of" 的用法，能更精准地表达对事物的确定性。在实际使用中，可根据语境灵活选择与 "be sure that" 或 "be sure about" 的转换，以增强表达的丰富性。