be sure of

为了搞清这个问题,我认为我们应当引用一下权威语言学家们的观点。

1. Janet is sure $\$left\{\begin{array}{l} to be put on the committee. [The speaker is confident] \\ of being put on the committee. [Janet is confident] (CGEL, § 18.35) \end{array}\right. 珍 妮特 $\$left\{\begin{array}{l} 肯定能进入委员会。 \\ 确信能进入委员会。 \end{array}\right.

George is sure to pass his exam. (The speaker is certain.) 乔治肯定能通过考试。

2. $\$left\{ \begin{array}{ll}\text{George is sure of passing his exam. (George himself is certain.) (RGSE, § 10.7)} & \text{乔治确信能通过考试。} \end{array} \right.

3. We can be sure of success... (EED) 我们可以确信我们一定会获得成功……

4. You could not always be sure of winning. (EED) 你不能总是确信自己会取胜。

例3-4证明，R.Quirk等人以及R.A.Close对be sure to do与be sure of所作的解释是符合英语的实际使用情况的。

至于用于第二人称的 be sure of 结构, 则有两种可能:

A. 表示主语的看法(如例4); B. 表示说话人的看法, 如你提出的例句。再如:

You're sure of a good dinner if you stay at that hotel. 如果你住那家旅馆，一定能吃到一顿很好的晚餐。

(参见 be sure to do/be sure of doing)