Assuming he's still alive, how old would he be now?
假定他還活著，現在有多大年紀了？
I was glad to hear you're alive and well.
聽說你健在我很高興。
She's alive ─ her heart is still beating.
她沒死——她的心臟還在跳動。
There is little hope that they will be found alive.
活著找到他們的希望很渺茫。
We don't know whether he's alive or dead.
我們不知道他是死是活。