be sure about/of

be sure about/of  确信……

【用法】

该短语后跟代词、名词或动词-ing形式。be sure还可以跟that，whether，where等引导的从句，表示某人”确信，肯定”。如：I'm sure that I can do better than you．我确信我能比你做得好。

She was not sure whether they could come or not．她不能确信他们是否能来。

【例句】

◆ She is sure of her success．她确信她会成功。

◆ He works in a school, but I am not sure about the school's name，他在一所学校工作，但我不能确定那所学校的名字。