Breakdown of Ta praca jest trudna, więc musisz być odpowiedzialny.
być
to be
ten
this (m)
praca
work
musieć
to have to
więc
so, therefore
trudny
difficult
odpowiedzialny
responsible
Questions & Answers about Ta praca jest trudna, więc musisz być odpowiedzialny.
Why does this sentence use the nominative odpowiedzialny after być, instead of the instrumental odpowiedzialnym?
When an adjective stands alone after być (to be) to describe the subject, it's very common in Polish—especially in everyday speech—to just leave it in the nominative case. Using the instrumental (odpowiedzialnym) is also correct and sounds a bit more formal or written, but the nominative is perfectly natural here.
Does the word odpowiedzialny tell us the gender of the person being spoken to?
Since ta praca is feminine, why isn't the adjective at the end feminine too (odpowiedzialna)?
Because the two clauses have completely different subjects! In the first half, the subject is ta praca (this job), so the adjective trudna (difficult) is feminine to match it. In the second half, the subject is the hidden "you" inside the verb musisz (you must). The adjective odpowiedzialny describes "you", not the job.
Could I use dlatego instead of więc to mean "so"?
Yes, but it changes the nuance slightly. Więc simply means "so" or "therefore," directly linking the consequence to the first clause. If you use dlatego (that's why / for that reason), it emphasizes the cause-and-effect relationship a bit more strongly: ..., dlatego musisz być odpowiedzialny.
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