Breakdown of Zostawiłem parasol u dentysty.
dentysta
dentist
zostawić
to leave behind (perfective)
parasol
umbrella
u
at, at the place of
Questions & Answers about Zostawiłem parasol u dentysty.
Why is the word for dentist dentysty here instead of dentysta?
The preposition u (meaning "at someone's place" or "at someone's business") always requires the following noun to be in the Genitive case. Even though dentysta is a masculine noun, it ends in -a, so it takes endings similar to feminine nouns. The Genitive form of dentysta is dentysty.
How do we know if the speaker is a man or a woman?
We know the speaker is male because the verb zostawiłem ends in -łem, which is the masculine ending for the first-person past tense. If a woman were speaking, she would say zostawiłam.
Why didn't the ending of parasol change?
It is actually in the Accusative case because it is the direct object of the verb (the thing being left). However, because parasol is a masculine inanimate noun (a non-living thing), its Accusative form looks exactly the same as its basic dictionary form.
Why don't we need a word for "my" before parasol?
In Polish, possessive pronouns like mój (my) are often left out when the context makes it obvious. Since you are the one who left the umbrella, it is naturally assumed to be yours unless you specify otherwise.