How to say in Czech: Are you alone here?

English
Are alone here?
Czech
Jsi tady sám?
You are alone here.
You are not alone here.
You are alone.
You are not alone.
You are not alone anymore.
Why do you want to be alone all the time?
You like being alone.
You need to be alone.
You were alone.
You were alone in the dark.

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