My father would turn in his grave if he knew.

我父亲知道的话在九泉之下也会不得安宁的。

《牛津词典》

I asked him if he knew that village.

我问他是否知道那个村庄。

youdao

He asked the farmer if he knew what he'd found.

他问那个农民是否知道自己捡到的是什么。

youdao

It's unclear if he knew the priest was allowed back into the parish and again had contact with children.

VOA: standard.2010.04.01

Why did God place the stupid fruit in the garden in the first place if he knew in advance that Adam and Eve were going to eat the thing?

如果他事先就知道偷食禁果的事情会发生,为什么还要把这个不祥的果实就那么放在园子里？

耶鲁公开课 - 弥尔顿课程节选

As I said, in some context last time, how many Russian peasants died in the 1890s thinking, "Oh my god, if the Czar only knew that we're starving, how angry he would be with his officials."

就像我在上一讲提到的,有多少死于1890年代的俄国农民会想,"上帝啊,要是沙皇知道我们在挨饿就好了,他该对手下的官员发多大的火啊"

耶鲁公开课 - 欧洲文明课程节选

"We asked if he knew anything about the captain and mate, " Kate Suski said.

NPR: US Tourists Survive Ship Sinking Near St. Lucia

The president testified he is not sure if he knew the subpoena asked for gifts.

CNN

Exasperated, I asked a security guard if he knew of any regular, good old American electrical outlets.

FORBES: Unions Are Evil And Weird