我肯定睡的姿势不舒适—我全身疼痛。

I must have slept in an awkward position—I'm aching all over.

《牛津词典》

“当然，”约翰说，就像一个对自己的记忆力失去信心的人，“他以前肯定不睡在狗窝里吧？”

"Surely," said John, like one who had lost faith in his memory, "he used not to sleep in the kennel?"

youdao

如果不是因为他可以更好的掌握自己，他会不情愿地回到树上，但有一件事是肯定的。

Mastered by his better self he would have returned reluctantly up the tree, but for one thing.

youdao

I was curious; I was even a user assistant at the time, I was certainly a geek at the time and yet I had no sense really of what actually went on in a classroom like this.

我很好奇，在当时我是一名助教，那时我肯定是一个怪胎,我真的不知道,这样的课上讲的是什么东西。

哈佛公开课 - 计算机科学课程节选

The answer that Yeats is giving here is different from saying either "yes" or "no" to that question.

叶芝此处给的答案,既不肯定也不否定。

耶鲁公开课 - 现代诗歌课程节选

And he says, "No, no, I'm too miserable and wretched," And the guy says, "Oh, you must be some kind of a merchant."

他推辞道,不,我的腿脚不利索,那些人答道,你肯定是到处兜售的商人

耶鲁公开课 - 古希腊历史简介课程节选