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》

Look, he is alive and kicking again.

瞧瞧他，又活蹦乱跳的了。

youdao

I just want to know if he is alive or dead.

我只是想知道他是活着还是死了。

youdao

The father of captive Israeli soldier Gilad Shalit is not optimistic about his son's release, despite a videotape published on Friday showing for the first time that he is alive and well.

VOA: standard.2009.10.03

One thing you cannot say about him is that he's culturally insensitive, arguably one of the most sensitive people alive.

但你不能说他在文化方面不敏感，他可以说是还在世的最敏感的人之一。

哈佛公开课 - 幸福课课程节选

Answer: It is possible that he would be alive and practicing law somewhere.

回答，他要是活过来,可能就开业当律师了。

耶鲁公开课 - 死亡课程节选

But we are hoping he is alive and his parachute got stuck in a tree or something.

CNN: STORY HIGHLIGHTS

Only the word of a local Hindu astrologer gives hope he is alive.

ECONOMIST: Sri Lanka's internally displaced

He is alive and unhit by the same hazard that leaves one tall palm tree standing where a hurricane has passed.

CNN: He remembers Papa