The word welch is another one that changes based on the noun after it. Use the der word endings!
Asking where in German can be tricky! Let’s look at the difference between wo, wohin, and woher.
Wo is used when an item is not moving. Think of it as X marks the spot!
Woher is used when asking where something or someone came from.
Wohin is asking where someone is going to! Notice that in English, we separate the where and the from or to, but in German, you combine them together into one word!
Don’t be fooled! The wo‑ in question words other than those listed in the previous sections does NOT mean where. When combined with with, about, and for, it means what.
Womit schreibt er?
What does he write with?
Wofür brauchst du das?
What do you need that for?
Worüber spricht sie?
What does she talk about?
Notice the ‑r‑ in worüber? It’s there because it would be too difficult to pronounce the two vowels next to each other otherwise!