摘要： be sure to do sth./ be sure of/about sb. or sth. (1)be sure to do sth.可以用来表示说话人给对方提出要求.意思是“务必 .也可以用来表示说话人做出的推断.意思是“一定 .“肯定 .例如: Be sure to lock the door when you leave.你离开时务必把门锁好. It’s a good film. You are sure to enjoy it.这是一部好电影.你肯定会喜欢的. (2)be sure of/about sb.or sth. 可用来表示“某人对某事有把握 .例如: I’m sure of his success.我相信他会成功. I think it was three years ago, but I’m not sure about it.我想那是三年前的事情.但我没有把握.

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