This is the 18th most frequent Polish word.
ze
"Ze" means "with" in English.
Here, 'ze' serves as a prepositional form used preceding the word 'szkoły' due to phonetic and syntactic compatibility, meaning 'from the school'.
Rozmawiałem z nauczycielem ze szkoły.
I talked with the teacher from the school.
In this sentence, 'ze' is a preposition modifying 'swojego wyboru' to convey a causal relation, meaning 'with regard to' in this context.
Jestem zadowolony ze swojego wyboru.
I am content with my choice.
In this sentence, 'ze' is a prepositional form used before the word 'znajomym' to indicate accompaniment and requires a specific grammatical form due to euphonious reasons.