Breakdown of Szef zapewnia, że umowa jest korzystna.
być
to be
szef
boss (m)
że
that
umowa
the contract
korzystny
favorable
zapewniać
to assure (zapewniam cię, że...)
Questions & Answers about Szef zapewnia, że umowa jest korzystna.
Why is there no Polish word for "us" in this sentence, even though the English translation says "assures us"?
In Polish, verbs like zapewniać (to assure) do not strictly require a direct object like nas (us) if the context is clear. The boss is making a general statement of assurance. You could explicitly say Szef zapewnia nas, but leaving the pronoun out is very natural and common.
Is the comma before że mandatory?
Yes, absolutely. Unlike in English, where you can often drop the comma or even omit the word "that" entirely, Polish grammar strictly requires a comma before że when it introduces a new clause.
Where does the adjective korzystna come from?
It comes from the noun korzyść, which means benefit or advantage. It takes the feminine ending -a here (korzystna) to match the gender of the noun it describes, which is umowa (contract).
Could I use the perfective verb zapewnić here instead of the imperfective zapewniać?
If you changed the present tense zapewnia to its perfective equivalent zapewni, it would completely change the tense. Perfective verbs cannot describe ongoing present actions, so zapewni means "will assure" (future tense), whereas zapewnia means "assures" or "is assuring".
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