How to say in Czech: Are they still alive?

English
Are still alive?
Czech
Jsou ještě naživu?
They are still alive.
Is your father still alive?
Are they alive?
We are happy to be alive.
He was buried alive.
Is he alive or dead?
They are still young.
They can still win this.
They still remember the smell of her hair.
Everybody is still sleeping.

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