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1·England must win this game to be sure of qualifying.

英格兰队必须拿下这场比赛才能确保获得资格。《牛津词典》

2·England must win this game to be sure of qualifying for the World Cup.

英格兰队必须拿下这场比赛才能确保获得世界杯的参赛资格。《牛津词典》

3·We have to be sure of that first.

我们得确信这是第一位的。

4·I have seen you. So I come here to be sure of it.

我看到了你，所以就跑了过来，确认一下。

5·To be sure of getting there on time, she left an hour early.

为了准时到达那里，她提前一个小时就离开了。

6·To be sure of someone's age, we must ask for the date of birth.

为了确认某人的年龄，我们就必须问他们的生日。

7·Testing helps manufacturers to be sure of a product's quality.

测试帮助制造业者确定产品的质量。

8·I would have to be a lot better person to be sure of God 'slove.

我要成为一个好的人才能肯定神对我的爱。

9·He needed to be sure of the weight and density of the gold used in the crown.

他需要确定用于冠中的黄金的重量和密度。

10·To be sure of success, one must be prepared, and what is more, fully prepared.

要有把握，就要有准备，而且要有充分的准备。