我很确定他们结婚前就睡在一起。

I'm pretty sure they slept together before they were married.

《柯林斯英汉双解大词典》

我很确定其他的学生在中心的水族馆实习，上海洋生物学课，然后向游客讲解各种各样的展览品。

I am pretty sure those other students are doing the internship at the center's aquarium, taking classes in marine biology and then teaching visitors about the various displays.

youdao

谁知道呢，但有一件事我很确定：她还没有写出畅销书。

Who knows, but there's one thing I am sure: she hasn't written a best-selling book yet.

youdao

I don't know about that. I am not so sure." But then, we realized that like when we walk out that door, it's the whole world again. So you get sucked up by your group, by your sort of identity.

我不知道，不是很确定，然后呢，我们就意识到走出那个大门，又是一个完整的世界，所以你就会,被你的团体，你的身份所束缚。

普林斯顿公开课 - 人性课程节选

And it's like, I am pretty sure I'm in an acting class with like 30 kids next year,

它就像，我很确定我在的那个表演班明年会招大约三十个新生。

和话剧专业的朋友 - SpeakingMax英语口语达人

I'm not clear that that kind of knowledge gives a whole lot of value to your life.

我不是很确定,这种知识会给你的生活带来多少价值。

耶鲁公开课 - 死亡课程节选