How to say in Czech: He has his own problems.

English
has his own problems.
Czech
On má své vlastní problémy.
He had to do everything on his own.
He figured it out all on his own.
He is old enough to stand on his own feet.
He started his own company.
He grows his own vegetables.
He is not used to being on his own.
He is old enough to make his own decisions.
Is he learning Arabic on his own?
He does not understand what the problem is.
To each his own.

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