`sure` 在英语中是一个副词，它可以用作肯定回答，表示“当然”、“的确”或“无疑”。以下是一些使用 `sure` 的例句：

Are you coming to the party？

Sure, I'll be there.

I'm sure you'll enjoy it.

此外，`sure` 也可以表示“无可置疑”或“千真万确”的意思。例如：

The answer is sure correct.

He is sure to succeed.

The fact is sure.

`Sure` 还可以用来表示“不偏离的”或“不动摇的”。例如：

He is sure of his beliefs.

The decision is sure to be made by the end of the week.