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1·He might get there in time, but I can't be sure.

他有可能准时到达，但我不敢肯定。《牛津词典》

2·A lot of people think that it's better to pay for their education so that they can be sure of getting quality.

很多人认为最好是自己掏钱受教育，为的是能肯定得到高品质的教育。《柯林斯英汉双解大词典》

3·Be sure you're recycling at home.

确保你在家会回收利用。

4·Be sure to keep this slip.

一定要保存好订单。

5·She had not known him long enough to be sure.

她认识他的时间还不够长，还不能肯定。

6·I should be sure you were a dream if you went.

如果你走了的话，我就会确定你是个梦。

7·Be sure the cue is clear and available, he cautions.

他警告说：“要确保线索清晰可用。”

8·But be sure the cue is clear and available, he cautions.

他警告说：“但要确保线索清晰可用。”

9·It maybe that some have them already, but we cannot be sure.

也许有些人已经拿到了，但我们不能肯定。

10·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》