Learn Polish: Ewa jest współzałożycielką, a ja jestem tylko współpracownikiem. - Ewa is a co-founder, and I am only a co-worker.

The prefix współ- is the Polish equivalent of the English 'co-' or 'jointly'. It attaches directly to the base nouns założycielka (female founder) and pracownik (worker) to create współzałożycielka (co-founder) and współpracownik (co-worker or collaborator), showing that a role or action is shared with someone else.

Why do the nouns end in -ą and -iem instead of their dictionary forms?

This is a refresher on a fundamental rule: when you define someone's identity, profession, or role using the verb być (to be), the noun that follows must take the Instrumental case. Therefore, the feminine dictionary form współzałożycielka changes to współzałożycielką, and the masculine współpracownik changes to współpracownikiem.

Why use the conjunction a here instead of i for the word 'and'?

While i simply adds things together without any friction, a is used to introduce a contrast or to shift the focus to a different subject. Here, it contrasts Ewa's high-level status as a co-founder with the speaker's lower-level status as 'only' a co-worker. It translates to 'and' but carries the flavor of 'whereas' or 'while'.

Since Polish usually drops subject pronouns, why is ja included before jestem?