Questions & Answers about Mój brat jest uczniem i czeka naprzeciwko szkoły.
Why does the word for school change to szkoły here?
It changes because of the preposition naprzeciwko (opposite). This preposition requires the noun that follows it to be in the Genitive case. Since szkoła is a feminine noun ending in -a, its Genitive form ends in -y, making it szkoły.
Why is it uczniem instead of uczeń?
The verb jest (is) triggers the Instrumental case when you describe someone's role, profession, or identity. Uczeń (school student) is a masculine noun, so it takes the Instrumental ending -em to become uczniem. Notice that the last -e- in uczeń drops out when adding the ending, which is a very common spelling change in Polish.
Does uczeń mean the same kind of student as student?
Not quite! In Polish, uczeń is used specifically for a pupil in primary or high school. The word student is strictly used for someone attending a university. Since he is an uczeń, it makes perfect sense that he is waiting opposite a szkoła (school).
Why don't we need the word on (he) before czeka?
Polish often drops subject pronouns when it is obvious who is doing the action. Here, the verb czeka (is waiting) is connected directly to mój brat (my brother) by the word i (and). The sentence flows smoothly as 'My brother is a student and waits' without needing to repeat the subject.