She does not know if he is alive or dead.

她不知道他是活还是死。

《柯林斯英汉双解大词典》

She does not know how to get to the next block.

她不清楚怎么去下一个街区。

youdao

She does not know what she says.

她不知道她说什么。

youdao

Amanda says she does not want children to ever give up because they do not know what they can do until they try.

VOA: special.2009.07.31

Jusu does not know the rebels who killed her daughter, but she is not afraid to speak out in front of her community.

VOA: standard.2010.06.07

But,she says, she does not yet know whether her baby has been infected.

VOA: standard.2010.07.01

Or she does not know how to choose flattering clothes that deemphasize her bust.

FORBES: Busted: Chest Size In The Office

Of course she does not know where the clothes that have survived her son have ended up.

NPR: Somalia's Farah: Humanizing a Broken Place

However, Ms Butler admits she does not know how to resolve the issue.

BBC: Rosemary Butler