Breakdown of Op welk perron staan we?
op
on
staan
to stand
welk
which (for het-words)
het perron
the platform
Questions & Answers about Op welk perron staan we?
Why do we use welk here instead of welke?
Because perron is a het-word (het perron). When asking "which" about a singular het-word, you must use welk. If it were a de-word or any plural noun, you would use welke.
In English we often put "on" at the end ("Which platform are we standing on?"). Why does op start the Dutch sentence?
In Dutch, you generally keep the preposition (op) together with the question word phrase it belongs to (welk perron). You can't leave op dangling at the end of the sentence. It maps directly to the slightly more formal English: "On which platform are we standing?".
Why are the verb and subject swapped around as staan we?
Because this is a question! The whole phrase Op welk perron takes the first spot in the sentence. In Dutch questions, the verb (staan) must come right after that question block, followed immediately by the subject (we).
Could I just say zijn we (are we) instead of staan we (stand we)?