如何使用 "sure" 造句

1. Now I 'm not so sure .
现在我不那么肯定了。
2. They are sure to be sellable in your market .
一定会在你方市场卖得很好的。
3. Sure they experienced numerous obstacles and setbacks and failures .
当然他们遇到大量的障碍和挫折和失败。
4. I sure was proud to have larry as a friend .
我的确为有拉里这样的朋友感到骄傲。
5. Because law isn 't a sure thing ?
因为法律不是一件可靠的事情吗?