be sure of 和 be sure to

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/04/28 19:29:16

e sure of/about + 名词,代词,动名词意为确信,对…有把握
表示对客观事物有肯定的认识和判断,主语必须是人.
e.g. As Jordan joined our team, we are sure of winning the game this time.
另外我们还要注意一些别的表达：
① be sure to … 一定,肯定
后接不定式往往表示局外人的推测,评论,主语不一定是人.
e.g. It's sure to rain tomorrow.
比较：
a. He is sure to live to ninety. 他肯定可以活到九十岁.
b. He is sure of living to ninety. 他自信可以活到九十岁.
② Be sure to 用于祈使句时,"务必,切望"解.
③ be sure 接that从句时,意为：认为…一定会,主语必须是人,连词that可以省略,be sure 后面还可以接由whether, where, when 或 who 等引导的名词性从句,这时,主句通常是否定形式.E.g.
我不能肯定今晚是否有空.
I am not sure whether I will be free or not tonight.
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