誰知道英文怎麼寫

I hope you're the only one who knows it.

但願只有你知道這件事。

Who knows most says least.

懂得最多的人，說得最少。

Who knows what they look like?

誰知道他們長什麼樣子呢？

Who knows when we'll be done?

誰知道我們什麼時候完成呢？