How to say in Czech: Whose child is this?

English
Whose child is this?
Czech
Čí je to dítě?
Whose room is this?
This is not my child.
What is this child doing here?
Who is this child?
Why is this child here?
Do you know this child?
Does anybody know this child?
He is just a child.
Are you an only child?
I am a child.

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