certain 与 sure 的用法

use形容词 adj
1.确信的,有把握的
I'm not sure whether our team will win.
我不能肯定我队是否能赢.
We are sure of his innocence.
我们确信他是无辜的.
2.一定的,必定的
She is sure to write to you.
她一定会给你写信的.
3.确实的;可靠的
One thing is sure, he won't let you down.
有一点是确定的,那就是他不会让你失望.
Exercise is a sure way of losing weight.
运动是减肥的可靠办法.
certain 作adj
1.确凿的,无疑的;可靠的
2.确信的,有把握的;一定会的
They are certain to succeed. (They are certain of success.) (They are certain that they will succeed.)
他们确信会成功.
I'm quite certain of that.
对那事我完全可以肯定.
I was certain that he had seen me.
我肯定他已看见了我.
3.某,一位姓...的(人)
A certain person called on you yesterday.
昨天有个人来拜访过你