短语结构为:主语 + be动词(am/is/are/was/were)+ sure of + 宾语
其中,of后面必须接“名词性成分”(名词、代词、动名词),不能接从句(接从句需用 "be sure that...")。以下是常见场景:
强调对某个人的品质、某个事物的真实性或情况的确定性。
I'm sure of his honesty.(我确信他的诚实。)
Are you sure of that?(你对那件事有把握吗?)
She's not sure of the answer.(她不确定答案。)
表示主语相信自己能完成某件事,或对做某事的结果有信心。
He's sure of winning the game.(他确信能赢这场比赛。)
I'm not sure of passing the driving test.(我不确定能通过驾照考试。)
表示“自信;自我肯定”,强调对自己的能力或判断有信心。
She's very sure of herself in public speaking.(她在公开演讲时非常自信。)
Don't be too sure of yourself—you might make a mistake.(别太自以为是,你可能会犯错。)
be sure of:主语的主观确信(“我认为…肯定”);
be sure to do:事情的客观必然性(“…肯定会发生”)。
例:
He's sure of coming on time.(他确信自己会准时来。→ 主观信心)
He's sure to come on time.(他肯定会准时来。→ 客观判断)
be sure of:后接名词性成分(不能接从句);
be sure that...:后接从句(表达完整的“确信的内容”)。
例:
I'm sure of his success.(我确信他的成功。→ 名词)
I'm sure that he will succeed.(我确信他会成功。→ 从句)
否定:在be动词后加not → be not sure of
例:I'm not sure of the time.(我不确定时间。)
疑问:将be动词提前 → Be + 主语 + sure of...?
例:Are you sure of your decision?(你对你的决定有把握吗?)
"be sure of" 是表达“主观确信”的核心短语,关键是记住of后接名词性成分,用于说明“对什么有把握”。通过例句多练习,就能熟练掌握~