所以我的心灵肯定不是我的身体。

So my mind must not be my body.

youdao

我知道厨房里的人肯定不是我的两个姐妹，因为她俩在床上睡得正香。

I knew that it wasn't one of my sisters in the kitchen, as they were both sound asleep in the other two beds.

youdao

你可能听错她的话了—我肯定她不是这个意思。

You may have misheard her—I'm sure she didn't mean that.

《牛津词典》

I'm not quite sure where, on balance, we should say how these things play out.

我不是很肯定，总的来说，这些事情是怎么进行的。

耶鲁公开课 - 死亡课程节选

I'm sure she didn't mean to say what she said.

我相信她肯定不是故意这么说的。

If I were 实战 - SpeakingMax英语口语达人

Well--since I myself don't believe in souls, it's hard to surprise you to learn that I don't think the soul theory of personal identity is right.

因为我本身不相信灵魂的存在，所以你们肯定能想到,我认为人格同一性的灵魂论,不是正确的。

耶鲁公开课 - 死亡课程节选