你能帮我搬这个箱子吗？ - 当然，我很乐意帮忙！

Can you help me move this box? - ___S-s-sure, I'd be happy to help!

他对自己的驾驶技术非常自信。

He is ___sure of his driving skills.

我、我确定他今天会来参加聚会。

I'm ___s-s-sure he will come to the party today.

你能帮我拿一下那个包吗？——当...当然可以。

Can you help me with that bag? — ___S-s-sure, no problem.