How to say in Czech: Did you came alone?

English
Did you came alone?
Czech
Přišel jsi sám?
You came alone.
Why do you want to be alone all the time?
You had to do everything alone.
I don’t want to go alone.
I don’t want to go there alone.
This is something I need to do alone.
Are you alone here?
Could I talk to you alone?
You are alone.
You are alone here.

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