这就是我一定相信你会保守此秘密的原因。

That's why I must trust you to keep this secret.

《柯林斯英汉双解大词典》

我什么也不会想，因为那只是虚幻而已，现实中这样我都不一定相信呢！

God loves this girl. He never gives her such a chance. To have the complete sadness.

youdao

不相信，可是我的两个最好的朋友一定相信人能够死而复活，因为他们在遗嘱中，把一切财产都留给了他们自己。

No, but two of my best friends must believe in reincarnation. In their wills they have left every - thing to themselves.

youdao

Expectation has been raised very high for this next thirty minutes and I know you will meet them.

观众们对接下来的半个小时都期望很高,但我相信您一定会不负众望。

普林斯顿公开课 - 人性课程节选

I know you can do great work.

我相信你一定会做出成绩的。

I'm ready to 课堂 - SpeakingMax英语口语达人

If somebody wants to believe something, I say what's the evidence for?

如果有人说他相信什么东西，我一定会问，有什么证据呢？

普林斯顿公开课 - 人性课程节选