How to say in Czech: Is he still alive?

English
Is still alive?
Czech
Je ještě naživu?
He is still alive.
Is your father still alive?
Is he alive?
Is he alive or dead?
He was buried alive.
I am happy to be alive.
He is still young.
He can still win this.
He still remembers the smell of her hair.
Everybody is still sleeping.

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