You are sure to have more fun.你们一定会玩得更高兴。 (教材P11)
be sure to do sth.肯定要做某事(表示将来)。
如: It’s sure to snow.天肯定要下雪。
be sure about/of sth. 确信或对某事有把握。
如: The question is so difficult. My teacher isn’t sure about/of its answer.这个问题如此有难度,我的老师对它的答案也没有把握。
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