I. Theory
Wo-compounds, like da-compounds, combine wo-, or wor-, with a wide array of prepositions. Wo-compounds are used to show prepositions involved in questions. In English, we would say: “What are you writing with?” In German this would be: “Womit schreibst du?” Although wo generally means “where”, it usually is translated as “what” in these situations.| Worauf wartest du? What are you waiting for? Woher kommst du? Where are you from? *Worüber denkst du nach? What are you thinking about? |
*Here, we see wor- instead because the preposition starts with a vowel.