Breakdown of Wir warten im Zug, weil der Anschlusszug Verspätung hat.
Questions & Answers about Wir warten im Zug, weil der Anschlusszug Verspätung hat.
Im is a contraction of in dem.
You can say in dem Zug if you want to emphasize or be very clear, but in normal speech and writing people almost always use im Zug.
You cannot say in der Zug, because Zug is masculine (der Zug), so its dative form is dem, not der.
Im Zug is dative case.
Reasoning:
- The preposition in can take either accusative (movement into) or dative (location).
- Here it describes a location (in the train), not movement into it, so you use the dative.
- Masculine dative of der Zug is dem Zug, and in dem contracts to im.