No. 2,515 in Polish
mateuszem
"Mateuszem" is the instrumental case of the Polish male name "Mateusz," meaning "with Mateusz" or "by Mateusz."
In a sentence
Spotkałem się wczoraj z Mateuszem.
I met up with Mateusz yesterday.
The word 'Mateuszem' is the instrumental form of the name 'Mateusz,' used here to indicate the means or accompaniment in the sentence.
W weekend wybieram się na wycieczkę z Mateuszem.
I am going on a trip with Mateusz this weekend.
The word 'Mateuszem' is again in instrumental form, specifying accompaniment in the context of going on a trip.
Rozmawiałam długo z Mateuszem o jego planach.
I talked with Mateusz about his plans for a long time.
In this sentence, 'Mateuszem' indicates the individual with whom the conversation took place, employing the instrumental case.
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