There is no knowing what may happen.

没人知道知道会发生什么事。

youdao

If you don't anticipate what may happen, you'll find yourself at a loss when sth. crops up.

你如果没有思想准备，事到临头就会抓瞎。

《新英汉大辞典》

Who could tell what may happen?

有谁知道将会发生什么事？

youdao

Clinton said in the absence of an Iranian reply, it is premature to talk about what may happen if Tehran ultimately rejects the offer.

VOA: standard.2009.11.09

Did I miss one there? This is what may, in fact, happen to you over time.

我错过了什么吗？事实上，这也许就会发生在你身上。

哈佛公开课 - 计算机科学课程节选

Since he's in the Senate and we don't know what's going to happen with the health care bill, he may not even be home.

VOA: special.2009.12.28

It's also interesting to consider what may happen at Heathrow as a result of the merger.

ECONOMIST: Business travel

But guessing what may happen and knowing how it would play out are two different scenarios.

FORBES: FOCUS: Gold Could Rally If U.S. Debt Ceiling Talks Falter

Others are looking to Wisconsin for signs of what may happen in the presidential race.

ECONOMIST: Wisconsin��s recall election