Breakdown of Im Kurs lesen wir verschiedene Bücher.
Questions & Answers about Im Kurs lesen wir verschiedene Bücher.
Im is a standard contraction of in dem.
So Im Kurs literally = in dem Kurs.
You can always un-contract it to In dem Kurs lesen wir verschiedene Bücher, which is grammatically correct but sounds a bit heavier or more formal in everyday speech. Im is what you would normally use in spoken German.
Because of im (in dem).
The preposition in can take either accusative or dative:
- Accusative = movement into something
- Ich gehe in den Kurs. – I’m going into the course.
- Dative = location / being in something
- Ich bin im Kurs. – I’m in the course.
In your sentence, im Kurs describes a location or setting (“in the course / during the course”), not movement, so dem Kurs (dative) is required, and that contracts to im Kurs.