现在我必须发电报叫你父亲来。

Now I must telegraph your father to come.

youdao

你能10:30来吗？我知道这不方便，但是我必须要见你。

Can you come at 10:30? I know it's inconvenient, but I have to see you.

《柯林斯英汉双解大词典》

我必须要找到某种方式来驾驭那个。

I just had to harness that somehow.

youdao

They're controversial, I think for obvious reasons, because you have to sacrifice an embryo in order to get them.

这些研究极富争议,我想原因很明显,因为你必须牺牲一个胚胎来取得干细胞

耶鲁公开课 - 生物医学工程探索课程节选

I had to move here. I lived in San Francisco which is on the other side of the country.

我必须要搬到这儿来。我本来住在旧金山，正好在这个国家的另一端。

写推荐书的人 - SpeakingMax英语口语达人

We had acknowledged that Alpha is a dominant strategy for my opponent so we must choose based upon, or knowing that my partner is going to choose Alpha.

我们发现了α是我们对手的优势策略,所以我们必须要根据,我对手会选α来做出选择

耶鲁公开课 - 博弈论课程节选