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1·He seemed so sure of his decision, how could he flip-flop so dramatically now?

他似乎对自己的决定非常肯定，现在怎么会戏剧性地改变立场呢？《柯林斯英汉双解大词典》

2·Are you sure of what you've said?

你确定你刚才所说的话吗？

3·Indeed, I am sure of it.

是的，我敢肯定。

4·You may be sure of that, said the hair-comb.

“你可以相信我的话。”梳子说。

5·So, as I said, not sure of numbers but of course we won't go over the maximum of 100.

所以，就像我说的，我们不确定具体的人数，但肯定不会超过一百人的上限。

6·She seems very sure of herself.

她好像十分自信。《牛津词典》

7·I hope you are sure of your facts.

我希望你能肯定你说的都是事实。《牛津词典》

8·You're always sure of a warm welcome there.

到了那里你肯定会受到热烈欢迎。《牛津词典》

9·One thing I am sure of was that she was scared.

有一点我可以肯定的是她被吓坏了。《柯林斯英汉双解大词典》

10·They scored another goal and made sure of victory.

他们又进了一个球，这就赢定了。《牛津词典》